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Diffstat (limited to 'include/rdma/uverbs_ioctl.h')
| -rw-r--r-- | include/rdma/uverbs_ioctl.h | 944 |
1 files changed, 944 insertions, 0 deletions
diff --git a/include/rdma/uverbs_ioctl.h b/include/rdma/uverbs_ioctl.h new file mode 100644 index 000000000..94fac5577 --- /dev/null +++ b/include/rdma/uverbs_ioctl.h @@ -0,0 +1,944 @@ +/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */ +/* + * Copyright (c) 2017, Mellanox Technologies inc. All rights reserved. + */ + +#ifndef _UVERBS_IOCTL_ +#define _UVERBS_IOCTL_ + +#include <rdma/uverbs_types.h> +#include <linux/uaccess.h> +#include <rdma/rdma_user_ioctl.h> +#include <rdma/ib_user_ioctl_verbs.h> +#include <rdma/ib_user_ioctl_cmds.h> + +/* + * ======================================= + * Verbs action specifications + * ======================================= + */ + +enum uverbs_attr_type { + UVERBS_ATTR_TYPE_NA, + UVERBS_ATTR_TYPE_PTR_IN, + UVERBS_ATTR_TYPE_PTR_OUT, + UVERBS_ATTR_TYPE_IDR, + UVERBS_ATTR_TYPE_FD, + UVERBS_ATTR_TYPE_ENUM_IN, + UVERBS_ATTR_TYPE_IDRS_ARRAY, +}; + +enum uverbs_obj_access { + UVERBS_ACCESS_READ, + UVERBS_ACCESS_WRITE, + UVERBS_ACCESS_NEW, + UVERBS_ACCESS_DESTROY +}; + +/* Specification of a single attribute inside the ioctl message */ +/* good size 16 */ +struct uverbs_attr_spec { + u8 type; + + /* + * Support extending attributes by length. Allow the user to provide + * more bytes than ptr.len, but check that everything after is zero'd + * by the user. + */ + u8 zero_trailing:1; + /* + * Valid only for PTR_IN. Allocate and copy the data inside + * the parser + */ + u8 alloc_and_copy:1; + u8 mandatory:1; + /* True if this is from UVERBS_ATTR_UHW */ + u8 is_udata:1; + + union { + struct { + /* Current known size to kernel */ + u16 len; + /* User isn't allowed to provide something < min_len */ + u16 min_len; + } ptr; + + struct { + /* + * higher bits mean the namespace and lower bits mean + * the type id within the namespace. + */ + u16 obj_type; + u8 access; + } obj; + + struct { + u8 num_elems; + } enum_def; + } u; + + /* This weird split lets us remove some padding */ + union { + struct { + /* + * The enum attribute can select one of the attributes + * contained in the ids array. Currently only PTR_IN + * attributes are supported in the ids array. + */ + const struct uverbs_attr_spec *ids; + } enum_def; + + struct { + /* + * higher bits mean the namespace and lower bits mean + * the type id within the namespace. + */ + u16 obj_type; + u16 min_len; + u16 max_len; + u8 access; + } objs_arr; + } u2; +}; + +/* + * Information about the API is loaded into a radix tree. For IOCTL we start + * with a tuple of: + * object_id, attr_id, method_id + * + * Which is a 48 bit value, with most of the bits guaranteed to be zero. Based + * on the current kernel support this is compressed into 16 bit key for the + * radix tree. Since this compression is entirely internal to the kernel the + * below limits can be revised if the kernel gains additional data. + * + * With 64 leafs per node this is a 3 level radix tree. + * + * The tree encodes multiple types, and uses a scheme where OBJ_ID,0,0 returns + * the object slot, and OBJ_ID,METH_ID,0 and returns the method slot. + * + * This also encodes the tables for the write() and write() extended commands + * using the coding + * OBJ_ID,UVERBS_API_METHOD_IS_WRITE,command # + * OBJ_ID,UVERBS_API_METHOD_IS_WRITE_EX,command_ex # + * ie the WRITE path is treated as a special method type in the ioctl + * framework. + */ +enum uapi_radix_data { + UVERBS_API_NS_FLAG = 1U << UVERBS_ID_NS_SHIFT, + + UVERBS_API_ATTR_KEY_BITS = 6, + UVERBS_API_ATTR_KEY_MASK = GENMASK(UVERBS_API_ATTR_KEY_BITS - 1, 0), + UVERBS_API_ATTR_BKEY_LEN = (1 << UVERBS_API_ATTR_KEY_BITS) - 1, + UVERBS_API_WRITE_KEY_NUM = 1 << UVERBS_API_ATTR_KEY_BITS, + + UVERBS_API_METHOD_KEY_BITS = 5, + UVERBS_API_METHOD_KEY_SHIFT = UVERBS_API_ATTR_KEY_BITS, + UVERBS_API_METHOD_KEY_NUM_CORE = 22, + UVERBS_API_METHOD_IS_WRITE = 30 << UVERBS_API_METHOD_KEY_SHIFT, + UVERBS_API_METHOD_IS_WRITE_EX = 31 << UVERBS_API_METHOD_KEY_SHIFT, + UVERBS_API_METHOD_KEY_NUM_DRIVER = + (UVERBS_API_METHOD_IS_WRITE >> UVERBS_API_METHOD_KEY_SHIFT) - + UVERBS_API_METHOD_KEY_NUM_CORE, + UVERBS_API_METHOD_KEY_MASK = GENMASK( + UVERBS_API_METHOD_KEY_BITS + UVERBS_API_METHOD_KEY_SHIFT - 1, + UVERBS_API_METHOD_KEY_SHIFT), + + UVERBS_API_OBJ_KEY_BITS = 5, + UVERBS_API_OBJ_KEY_SHIFT = + UVERBS_API_METHOD_KEY_BITS + UVERBS_API_METHOD_KEY_SHIFT, + UVERBS_API_OBJ_KEY_NUM_CORE = 20, + UVERBS_API_OBJ_KEY_NUM_DRIVER = + (1 << UVERBS_API_OBJ_KEY_BITS) - UVERBS_API_OBJ_KEY_NUM_CORE, + UVERBS_API_OBJ_KEY_MASK = GENMASK(31, UVERBS_API_OBJ_KEY_SHIFT), + + /* This id guaranteed to not exist in the radix tree */ + UVERBS_API_KEY_ERR = 0xFFFFFFFF, +}; + +static inline __attribute_const__ u32 uapi_key_obj(u32 id) +{ + if (id & UVERBS_API_NS_FLAG) { + id &= ~UVERBS_API_NS_FLAG; + if (id >= UVERBS_API_OBJ_KEY_NUM_DRIVER) + return UVERBS_API_KEY_ERR; + id = id + UVERBS_API_OBJ_KEY_NUM_CORE; + } else { + if (id >= UVERBS_API_OBJ_KEY_NUM_CORE) + return UVERBS_API_KEY_ERR; + } + + return id << UVERBS_API_OBJ_KEY_SHIFT; +} + +static inline __attribute_const__ bool uapi_key_is_object(u32 key) +{ + return (key & ~UVERBS_API_OBJ_KEY_MASK) == 0; +} + +static inline __attribute_const__ u32 uapi_key_ioctl_method(u32 id) +{ + if (id & UVERBS_API_NS_FLAG) { + id &= ~UVERBS_API_NS_FLAG; + if (id >= UVERBS_API_METHOD_KEY_NUM_DRIVER) + return UVERBS_API_KEY_ERR; + id = id + UVERBS_API_METHOD_KEY_NUM_CORE; + } else { + id++; + if (id >= UVERBS_API_METHOD_KEY_NUM_CORE) + return UVERBS_API_KEY_ERR; + } + + return id << UVERBS_API_METHOD_KEY_SHIFT; +} + +static inline __attribute_const__ u32 uapi_key_write_method(u32 id) +{ + if (id >= UVERBS_API_WRITE_KEY_NUM) + return UVERBS_API_KEY_ERR; + return UVERBS_API_METHOD_IS_WRITE | id; +} + +static inline __attribute_const__ u32 uapi_key_write_ex_method(u32 id) +{ + if (id >= UVERBS_API_WRITE_KEY_NUM) + return UVERBS_API_KEY_ERR; + return UVERBS_API_METHOD_IS_WRITE_EX | id; +} + +static inline __attribute_const__ u32 +uapi_key_attr_to_ioctl_method(u32 attr_key) +{ + return attr_key & + (UVERBS_API_OBJ_KEY_MASK | UVERBS_API_METHOD_KEY_MASK); +} + +static inline __attribute_const__ bool uapi_key_is_ioctl_method(u32 key) +{ + unsigned int method = key & UVERBS_API_METHOD_KEY_MASK; + + return method != 0 && method < UVERBS_API_METHOD_IS_WRITE && + (key & UVERBS_API_ATTR_KEY_MASK) == 0; +} + +static inline __attribute_const__ bool uapi_key_is_write_method(u32 key) +{ + return (key & UVERBS_API_METHOD_KEY_MASK) == UVERBS_API_METHOD_IS_WRITE; +} + +static inline __attribute_const__ bool uapi_key_is_write_ex_method(u32 key) +{ + return (key & UVERBS_API_METHOD_KEY_MASK) == + UVERBS_API_METHOD_IS_WRITE_EX; +} + +static inline __attribute_const__ u32 uapi_key_attrs_start(u32 ioctl_method_key) +{ + /* 0 is the method slot itself */ + return ioctl_method_key + 1; +} + +static inline __attribute_const__ u32 uapi_key_attr(u32 id) +{ + /* + * The attr is designed to fit in the typical single radix tree node + * of 64 entries. Since allmost all methods have driver attributes we + * organize things so that the driver and core attributes interleave to + * reduce the length of the attributes array in typical cases. + */ + if (id & UVERBS_API_NS_FLAG) { + id &= ~UVERBS_API_NS_FLAG; + id++; + if (id >= 1 << (UVERBS_API_ATTR_KEY_BITS - 1)) + return UVERBS_API_KEY_ERR; + id = (id << 1) | 0; + } else { + if (id >= 1 << (UVERBS_API_ATTR_KEY_BITS - 1)) + return UVERBS_API_KEY_ERR; + id = (id << 1) | 1; + } + + return id; +} + +/* Only true for ioctl methods */ +static inline __attribute_const__ bool uapi_key_is_attr(u32 key) +{ + unsigned int method = key & UVERBS_API_METHOD_KEY_MASK; + + return method != 0 && method < UVERBS_API_METHOD_IS_WRITE && + (key & UVERBS_API_ATTR_KEY_MASK) != 0; +} + +/* + * This returns a value in the range [0 to UVERBS_API_ATTR_BKEY_LEN), + * basically it undoes the reservation of 0 in the ID numbering. attr_key + * must already be masked with UVERBS_API_ATTR_KEY_MASK, or be the output of + * uapi_key_attr(). + */ +static inline __attribute_const__ u32 uapi_bkey_attr(u32 attr_key) +{ + return attr_key - 1; +} + +static inline __attribute_const__ u32 uapi_bkey_to_key_attr(u32 attr_bkey) +{ + return attr_bkey + 1; +} + +/* + * ======================================= + * Verbs definitions + * ======================================= + */ + +struct uverbs_attr_def { + u16 id; + struct uverbs_attr_spec attr; +}; + +struct uverbs_method_def { + u16 id; + /* Combination of bits from enum UVERBS_ACTION_FLAG_XXXX */ + u32 flags; + size_t num_attrs; + const struct uverbs_attr_def * const (*attrs)[]; + int (*handler)(struct uverbs_attr_bundle *attrs); +}; + +struct uverbs_object_def { + u16 id; + const struct uverbs_obj_type *type_attrs; + size_t num_methods; + const struct uverbs_method_def * const (*methods)[]; +}; + +enum uapi_definition_kind { + UAPI_DEF_END = 0, + UAPI_DEF_OBJECT_START, + UAPI_DEF_WRITE, + UAPI_DEF_CHAIN_OBJ_TREE, + UAPI_DEF_CHAIN, + UAPI_DEF_IS_SUPPORTED_FUNC, + UAPI_DEF_IS_SUPPORTED_DEV_FN, +}; + +enum uapi_definition_scope { + UAPI_SCOPE_OBJECT = 1, + UAPI_SCOPE_METHOD = 2, +}; + +struct uapi_definition { + u8 kind; + u8 scope; + union { + struct { + u16 object_id; + } object_start; + struct { + u16 command_num; + u8 is_ex:1; + u8 has_udata:1; + u8 has_resp:1; + u8 req_size; + u8 resp_size; + } write; + }; + + union { + bool (*func_is_supported)(struct ib_device *device); + int (*func_write)(struct uverbs_attr_bundle *attrs); + const struct uapi_definition *chain; + const struct uverbs_object_def *chain_obj_tree; + size_t needs_fn_offset; + }; +}; + +/* Define things connected to object_id */ +#define DECLARE_UVERBS_OBJECT(_object_id, ...) \ + { \ + .kind = UAPI_DEF_OBJECT_START, \ + .object_start = { .object_id = _object_id }, \ + }, \ + ##__VA_ARGS__ + +/* Use in a var_args of DECLARE_UVERBS_OBJECT */ +#define DECLARE_UVERBS_WRITE(_command_num, _func, _cmd_desc, ...) \ + { \ + .kind = UAPI_DEF_WRITE, \ + .scope = UAPI_SCOPE_OBJECT, \ + .write = { .is_ex = 0, .command_num = _command_num }, \ + .func_write = _func, \ + _cmd_desc, \ + }, \ + ##__VA_ARGS__ + +/* Use in a var_args of DECLARE_UVERBS_OBJECT */ +#define DECLARE_UVERBS_WRITE_EX(_command_num, _func, _cmd_desc, ...) \ + { \ + .kind = UAPI_DEF_WRITE, \ + .scope = UAPI_SCOPE_OBJECT, \ + .write = { .is_ex = 1, .command_num = _command_num }, \ + .func_write = _func, \ + _cmd_desc, \ + }, \ + ##__VA_ARGS__ + +/* + * Object is only supported if the function pointer named ibdev_fn in struct + * ib_device is not NULL. + */ +#define UAPI_DEF_OBJ_NEEDS_FN(ibdev_fn) \ + { \ + .kind = UAPI_DEF_IS_SUPPORTED_DEV_FN, \ + .scope = UAPI_SCOPE_OBJECT, \ + .needs_fn_offset = \ + offsetof(struct ib_device_ops, ibdev_fn) + \ + BUILD_BUG_ON_ZERO(sizeof_field(struct ib_device_ops, \ + ibdev_fn) != \ + sizeof(void *)), \ + } + +/* + * Method is only supported if the function pointer named ibdev_fn in struct + * ib_device is not NULL. + */ +#define UAPI_DEF_METHOD_NEEDS_FN(ibdev_fn) \ + { \ + .kind = UAPI_DEF_IS_SUPPORTED_DEV_FN, \ + .scope = UAPI_SCOPE_METHOD, \ + .needs_fn_offset = \ + offsetof(struct ib_device_ops, ibdev_fn) + \ + BUILD_BUG_ON_ZERO(sizeof_field(struct ib_device_ops, \ + ibdev_fn) != \ + sizeof(void *)), \ + } + +/* Call a function to determine if the entire object is supported or not */ +#define UAPI_DEF_IS_OBJ_SUPPORTED(_func) \ + { \ + .kind = UAPI_DEF_IS_SUPPORTED_FUNC, \ + .scope = UAPI_SCOPE_OBJECT, .func_is_supported = _func, \ + } + +/* Include another struct uapi_definition in this one */ +#define UAPI_DEF_CHAIN(_def_var) \ + { \ + .kind = UAPI_DEF_CHAIN, .chain = _def_var, \ + } + +/* Temporary until the tree base description is replaced */ +#define UAPI_DEF_CHAIN_OBJ_TREE(_object_enum, _object_ptr, ...) \ + { \ + .kind = UAPI_DEF_CHAIN_OBJ_TREE, \ + .object_start = { .object_id = _object_enum }, \ + .chain_obj_tree = _object_ptr, \ + }, \ + ##__VA_ARGS__ +#define UAPI_DEF_CHAIN_OBJ_TREE_NAMED(_object_enum, ...) \ + UAPI_DEF_CHAIN_OBJ_TREE(_object_enum, &UVERBS_OBJECT(_object_enum), \ + ##__VA_ARGS__) + +/* + * ======================================= + * Attribute Specifications + * ======================================= + */ + +#define UVERBS_ATTR_SIZE(_min_len, _len) \ + .u.ptr.min_len = _min_len, .u.ptr.len = _len + +#define UVERBS_ATTR_NO_DATA() UVERBS_ATTR_SIZE(0, 0) + +/* + * Specifies a uapi structure that cannot be extended. The user must always + * supply the whole structure and nothing more. The structure must be declared + * in a header under include/uapi/rdma. + */ +#define UVERBS_ATTR_TYPE(_type) \ + .u.ptr.min_len = sizeof(_type), .u.ptr.len = sizeof(_type) +/* + * Specifies a uapi structure where the user must provide at least up to + * member 'last'. Anything after last and up until the end of the structure + * can be non-zero, anything longer than the end of the structure must be + * zero. The structure must be declared in a header under include/uapi/rdma. + */ +#define UVERBS_ATTR_STRUCT(_type, _last) \ + .zero_trailing = 1, \ + UVERBS_ATTR_SIZE(offsetofend(_type, _last), sizeof(_type)) +/* + * Specifies at least min_len bytes must be passed in, but the amount can be + * larger, up to the protocol maximum size. No check for zeroing is done. + */ +#define UVERBS_ATTR_MIN_SIZE(_min_len) UVERBS_ATTR_SIZE(_min_len, USHRT_MAX) + +/* Must be used in the '...' of any UVERBS_ATTR */ +#define UA_ALLOC_AND_COPY .alloc_and_copy = 1 +#define UA_MANDATORY .mandatory = 1 +#define UA_OPTIONAL .mandatory = 0 + +/* + * min_len must be bigger than 0 and _max_len must be smaller than 4095. Only + * READ\WRITE accesses are supported. + */ +#define UVERBS_ATTR_IDRS_ARR(_attr_id, _idr_type, _access, _min_len, _max_len, \ + ...) \ + (&(const struct uverbs_attr_def){ \ + .id = (_attr_id) + \ + BUILD_BUG_ON_ZERO((_min_len) == 0 || \ + (_max_len) > \ + PAGE_SIZE / sizeof(void *) || \ + (_min_len) > (_max_len) || \ + (_access) == UVERBS_ACCESS_NEW || \ + (_access) == UVERBS_ACCESS_DESTROY), \ + .attr = { .type = UVERBS_ATTR_TYPE_IDRS_ARRAY, \ + .u2.objs_arr.obj_type = _idr_type, \ + .u2.objs_arr.access = _access, \ + .u2.objs_arr.min_len = _min_len, \ + .u2.objs_arr.max_len = _max_len, \ + __VA_ARGS__ } }) + +/* + * Only for use with UVERBS_ATTR_IDR, allows any uobject type to be accepted, + * the user must validate the type of the uobject instead. + */ +#define UVERBS_IDR_ANY_OBJECT 0xFFFF + +#define UVERBS_ATTR_IDR(_attr_id, _idr_type, _access, ...) \ + (&(const struct uverbs_attr_def){ \ + .id = _attr_id, \ + .attr = { .type = UVERBS_ATTR_TYPE_IDR, \ + .u.obj.obj_type = _idr_type, \ + .u.obj.access = _access, \ + __VA_ARGS__ } }) + +#define UVERBS_ATTR_FD(_attr_id, _fd_type, _access, ...) \ + (&(const struct uverbs_attr_def){ \ + .id = (_attr_id) + \ + BUILD_BUG_ON_ZERO((_access) != UVERBS_ACCESS_NEW && \ + (_access) != UVERBS_ACCESS_READ), \ + .attr = { .type = UVERBS_ATTR_TYPE_FD, \ + .u.obj.obj_type = _fd_type, \ + .u.obj.access = _access, \ + __VA_ARGS__ } }) + +#define UVERBS_ATTR_PTR_IN(_attr_id, _type, ...) \ + (&(const struct uverbs_attr_def){ \ + .id = _attr_id, \ + .attr = { .type = UVERBS_ATTR_TYPE_PTR_IN, \ + _type, \ + __VA_ARGS__ } }) + +#define UVERBS_ATTR_PTR_OUT(_attr_id, _type, ...) \ + (&(const struct uverbs_attr_def){ \ + .id = _attr_id, \ + .attr = { .type = UVERBS_ATTR_TYPE_PTR_OUT, \ + _type, \ + __VA_ARGS__ } }) + +/* _enum_arry should be a 'static const union uverbs_attr_spec[]' */ +#define UVERBS_ATTR_ENUM_IN(_attr_id, _enum_arr, ...) \ + (&(const struct uverbs_attr_def){ \ + .id = _attr_id, \ + .attr = { .type = UVERBS_ATTR_TYPE_ENUM_IN, \ + .u2.enum_def.ids = _enum_arr, \ + .u.enum_def.num_elems = ARRAY_SIZE(_enum_arr), \ + __VA_ARGS__ }, \ + }) + +/* An input value that is a member in the enum _enum_type. */ +#define UVERBS_ATTR_CONST_IN(_attr_id, _enum_type, ...) \ + UVERBS_ATTR_PTR_IN( \ + _attr_id, \ + UVERBS_ATTR_SIZE( \ + sizeof(u64) + BUILD_BUG_ON_ZERO(!sizeof(_enum_type)), \ + sizeof(u64)), \ + __VA_ARGS__) + +/* + * An input value that is a bitwise combination of values of _enum_type. + * This permits the flag value to be passed as either a u32 or u64, it must + * be retrieved via uverbs_get_flag(). + */ +#define UVERBS_ATTR_FLAGS_IN(_attr_id, _enum_type, ...) \ + UVERBS_ATTR_PTR_IN( \ + _attr_id, \ + UVERBS_ATTR_SIZE(sizeof(u32) + BUILD_BUG_ON_ZERO( \ + !sizeof(_enum_type *)), \ + sizeof(u64)), \ + __VA_ARGS__) + +/* + * This spec is used in order to pass information to the hardware driver in a + * legacy way. Every verb that could get driver specific data should get this + * spec. + */ +#define UVERBS_ATTR_UHW() \ + UVERBS_ATTR_PTR_IN(UVERBS_ATTR_UHW_IN, \ + UVERBS_ATTR_MIN_SIZE(0), \ + UA_OPTIONAL, \ + .is_udata = 1), \ + UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_UHW_OUT, \ + UVERBS_ATTR_MIN_SIZE(0), \ + UA_OPTIONAL, \ + .is_udata = 1) + +/* ================================================= + * Parsing infrastructure + * ================================================= + */ + + +struct uverbs_ptr_attr { + /* + * If UVERBS_ATTR_SPEC_F_ALLOC_AND_COPY is set then the 'ptr' is + * used. + */ + union { + void *ptr; + u64 data; + }; + u16 len; + u16 uattr_idx; + u8 enum_id; +}; + +struct uverbs_obj_attr { + struct ib_uobject *uobject; + const struct uverbs_api_attr *attr_elm; +}; + +struct uverbs_objs_arr_attr { + struct ib_uobject **uobjects; + u16 len; +}; + +struct uverbs_attr { + union { + struct uverbs_ptr_attr ptr_attr; + struct uverbs_obj_attr obj_attr; + struct uverbs_objs_arr_attr objs_arr_attr; + }; +}; + +struct uverbs_attr_bundle { + struct ib_udata driver_udata; + struct ib_udata ucore; + struct ib_uverbs_file *ufile; + struct ib_ucontext *context; + struct ib_uobject *uobject; + DECLARE_BITMAP(attr_present, UVERBS_API_ATTR_BKEY_LEN); + struct uverbs_attr attrs[]; +}; + +static inline bool uverbs_attr_is_valid(const struct uverbs_attr_bundle *attrs_bundle, + unsigned int idx) +{ + return test_bit(uapi_bkey_attr(uapi_key_attr(idx)), + attrs_bundle->attr_present); +} + +/** + * rdma_udata_to_drv_context - Helper macro to get the driver's context out of + * ib_udata which is embedded in uverbs_attr_bundle. + * + * If udata is not NULL this cannot fail. Otherwise a NULL udata will result + * in a NULL ucontext pointer, as a safety precaution. Callers should be using + * 'udata' to determine if the driver call is in user or kernel mode, not + * 'ucontext'. + * + */ +#define rdma_udata_to_drv_context(udata, drv_dev_struct, member) \ + (udata ? container_of(container_of(udata, struct uverbs_attr_bundle, \ + driver_udata) \ + ->context, \ + drv_dev_struct, member) : \ + (drv_dev_struct *)NULL) + +#define IS_UVERBS_COPY_ERR(_ret) ((_ret) && (_ret) != -ENOENT) + +static inline const struct uverbs_attr *uverbs_attr_get(const struct uverbs_attr_bundle *attrs_bundle, + u16 idx) +{ + if (!uverbs_attr_is_valid(attrs_bundle, idx)) + return ERR_PTR(-ENOENT); + + return &attrs_bundle->attrs[uapi_bkey_attr(uapi_key_attr(idx))]; +} + +static inline int uverbs_attr_get_enum_id(const struct uverbs_attr_bundle *attrs_bundle, + u16 idx) +{ + const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx); + + if (IS_ERR(attr)) + return PTR_ERR(attr); + + return attr->ptr_attr.enum_id; +} + +static inline void *uverbs_attr_get_obj(const struct uverbs_attr_bundle *attrs_bundle, + u16 idx) +{ + const struct uverbs_attr *attr; + + attr = uverbs_attr_get(attrs_bundle, idx); + if (IS_ERR(attr)) + return ERR_CAST(attr); + + return attr->obj_attr.uobject->object; +} + +static inline struct ib_uobject *uverbs_attr_get_uobject(const struct uverbs_attr_bundle *attrs_bundle, + u16 idx) +{ + const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx); + + if (IS_ERR(attr)) + return ERR_CAST(attr); + + return attr->obj_attr.uobject; +} + +static inline int +uverbs_attr_get_len(const struct uverbs_attr_bundle *attrs_bundle, u16 idx) +{ + const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx); + + if (IS_ERR(attr)) + return PTR_ERR(attr); + + return attr->ptr_attr.len; +} + +void uverbs_finalize_uobj_create(const struct uverbs_attr_bundle *attrs_bundle, + u16 idx); + +/* + * uverbs_attr_ptr_get_array_size() - Get array size pointer by a ptr + * attribute. + * @attrs: The attribute bundle + * @idx: The ID of the attribute + * @elem_size: The size of the element in the array + */ +static inline int +uverbs_attr_ptr_get_array_size(struct uverbs_attr_bundle *attrs, u16 idx, + size_t elem_size) +{ + int size = uverbs_attr_get_len(attrs, idx); + + if (size < 0) + return size; + + if (size % elem_size) + return -EINVAL; + + return size / elem_size; +} + +/** + * uverbs_attr_get_uobjs_arr() - Provides array's properties for attribute for + * UVERBS_ATTR_TYPE_IDRS_ARRAY. + * @arr: Returned pointer to array of pointers for uobjects or NULL if + * the attribute isn't provided. + * + * Return: The array length or 0 if no attribute was provided. + */ +static inline int uverbs_attr_get_uobjs_arr( + const struct uverbs_attr_bundle *attrs_bundle, u16 attr_idx, + struct ib_uobject ***arr) +{ + const struct uverbs_attr *attr = + uverbs_attr_get(attrs_bundle, attr_idx); + + if (IS_ERR(attr)) { + *arr = NULL; + return 0; + } + + *arr = attr->objs_arr_attr.uobjects; + + return attr->objs_arr_attr.len; +} + +static inline bool uverbs_attr_ptr_is_inline(const struct uverbs_attr *attr) +{ + return attr->ptr_attr.len <= sizeof(attr->ptr_attr.data); +} + +static inline void *uverbs_attr_get_alloced_ptr( + const struct uverbs_attr_bundle *attrs_bundle, u16 idx) +{ + const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx); + + if (IS_ERR(attr)) + return (void *)attr; + + return uverbs_attr_ptr_is_inline(attr) ? (void *)&attr->ptr_attr.data : + attr->ptr_attr.ptr; +} + +static inline int _uverbs_copy_from(void *to, + const struct uverbs_attr_bundle *attrs_bundle, + size_t idx, + size_t size) +{ + const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx); + + if (IS_ERR(attr)) + return PTR_ERR(attr); + + /* + * Validation ensures attr->ptr_attr.len >= size. If the caller is + * using UVERBS_ATTR_SPEC_F_MIN_SZ_OR_ZERO then it must call + * uverbs_copy_from_or_zero. + */ + if (unlikely(size < attr->ptr_attr.len)) + return -EINVAL; + + if (uverbs_attr_ptr_is_inline(attr)) + memcpy(to, &attr->ptr_attr.data, attr->ptr_attr.len); + else if (copy_from_user(to, u64_to_user_ptr(attr->ptr_attr.data), + attr->ptr_attr.len)) + return -EFAULT; + + return 0; +} + +static inline int _uverbs_copy_from_or_zero(void *to, + const struct uverbs_attr_bundle *attrs_bundle, + size_t idx, + size_t size) +{ + const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx); + size_t min_size; + + if (IS_ERR(attr)) + return PTR_ERR(attr); + + min_size = min_t(size_t, size, attr->ptr_attr.len); + + if (uverbs_attr_ptr_is_inline(attr)) + memcpy(to, &attr->ptr_attr.data, min_size); + else if (copy_from_user(to, u64_to_user_ptr(attr->ptr_attr.data), + min_size)) + return -EFAULT; + + if (size > min_size) + memset(to + min_size, 0, size - min_size); + + return 0; +} + +#define uverbs_copy_from(to, attrs_bundle, idx) \ + _uverbs_copy_from(to, attrs_bundle, idx, sizeof(*to)) + +#define uverbs_copy_from_or_zero(to, attrs_bundle, idx) \ + _uverbs_copy_from_or_zero(to, attrs_bundle, idx, sizeof(*to)) + +static inline struct ib_ucontext * +ib_uverbs_get_ucontext(const struct uverbs_attr_bundle *attrs) +{ + return ib_uverbs_get_ucontext_file(attrs->ufile); +} + +#if IS_ENABLED(CONFIG_INFINIBAND_USER_ACCESS) +int uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle, + size_t idx, u64 allowed_bits); +int uverbs_get_flags32(u32 *to, const struct uverbs_attr_bundle *attrs_bundle, + size_t idx, u64 allowed_bits); +int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle, size_t idx, + const void *from, size_t size); +__malloc void *_uverbs_alloc(struct uverbs_attr_bundle *bundle, size_t size, + gfp_t flags); + +static inline __malloc void *uverbs_alloc(struct uverbs_attr_bundle *bundle, + size_t size) +{ + return _uverbs_alloc(bundle, size, GFP_KERNEL); +} + +static inline __malloc void *uverbs_zalloc(struct uverbs_attr_bundle *bundle, + size_t size) +{ + return _uverbs_alloc(bundle, size, GFP_KERNEL | __GFP_ZERO); +} + +static inline __malloc void *uverbs_kcalloc(struct uverbs_attr_bundle *bundle, + size_t n, size_t size) +{ + size_t bytes; + + if (unlikely(check_mul_overflow(n, size, &bytes))) + return ERR_PTR(-EOVERFLOW); + return uverbs_zalloc(bundle, bytes); +} +int _uverbs_get_const(s64 *to, const struct uverbs_attr_bundle *attrs_bundle, + size_t idx, s64 lower_bound, u64 upper_bound, + s64 *def_val); +int uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle, + size_t idx, const void *from, size_t size); +#else +static inline int +uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle, + size_t idx, u64 allowed_bits) +{ + return -EINVAL; +} +static inline int +uverbs_get_flags32(u32 *to, const struct uverbs_attr_bundle *attrs_bundle, + size_t idx, u64 allowed_bits) +{ + return -EINVAL; +} +static inline int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle, + size_t idx, const void *from, size_t size) +{ + return -EINVAL; +} +static inline __malloc void *uverbs_alloc(struct uverbs_attr_bundle *bundle, + size_t size) +{ + return ERR_PTR(-EINVAL); +} +static inline __malloc void *uverbs_zalloc(struct uverbs_attr_bundle *bundle, + size_t size) +{ + return ERR_PTR(-EINVAL); +} +static inline int +_uverbs_get_const(s64 *to, const struct uverbs_attr_bundle *attrs_bundle, + size_t idx, s64 lower_bound, u64 upper_bound, + s64 *def_val) +{ + return -EINVAL; +} +static inline int +uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle, + size_t idx, const void *from, size_t size) +{ + return -EINVAL; +} +#endif + +#define uverbs_get_const(_to, _attrs_bundle, _idx) \ + ({ \ + s64 _val; \ + int _ret = _uverbs_get_const(&_val, _attrs_bundle, _idx, \ + type_min(typeof(*_to)), \ + type_max(typeof(*_to)), NULL); \ + (*_to) = _val; \ + _ret; \ + }) + +#define uverbs_get_const_default(_to, _attrs_bundle, _idx, _default) \ + ({ \ + s64 _val; \ + s64 _def_val = _default; \ + int _ret = \ + _uverbs_get_const(&_val, _attrs_bundle, _idx, \ + type_min(typeof(*_to)), \ + type_max(typeof(*_to)), &_def_val); \ + (*_to) = _val; \ + _ret; \ + }) +#endif |