summaryrefslogtreecommitdiffstats
path: root/include/rdma/uverbs_ioctl.h
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
commit5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch)
treea94efe259b9009378be6d90eb30d2b019d95c194 /include/rdma/uverbs_ioctl.h
parentInitial commit. (diff)
downloadlinux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz
linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'include/rdma/uverbs_ioctl.h')
-rw-r--r--include/rdma/uverbs_ioctl.h944
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