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linux-sg2042/include/rdma/uverbs_ioctl.h

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/*
* Copyright (c) 2017, Mellanox Technologies inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#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,
};
enum uverbs_obj_access {
UVERBS_ACCESS_READ,
UVERBS_ACCESS_WRITE,
UVERBS_ACCESS_NEW,
UVERBS_ACCESS_DESTROY
};
enum {
UVERBS_ATTR_SPEC_F_MANDATORY = 1U << 0,
/* Support extending attributes by length, validate all unknown size == zero */
UVERBS_ATTR_SPEC_F_MIN_SZ_OR_ZERO = 1U << 1,
};
/* Specification of a single attribute inside the ioctl message */
struct uverbs_attr_spec {
union {
/* Header shared by all following union members - to reduce space. */
struct {
enum uverbs_attr_type type;
/* Combination of bits from enum UVERBS_ATTR_SPEC_F_XXXX */
u8 flags;
};
struct {
enum uverbs_attr_type type;
/* Combination of bits from enum UVERBS_ATTR_SPEC_F_XXXX */
u8 flags;
/* Current known size to kernel */
u16 len;
/* User isn't allowed to provide something < min_len */
u16 min_len;
} ptr;
struct {
enum uverbs_attr_type type;
/* Combination of bits from enum UVERBS_ATTR_SPEC_F_XXXX */
u8 flags;
/*
* higher bits mean the namespace and lower bits mean
* the type id within the namespace.
*/
u16 obj_type;
u8 access;
} obj;
struct {
enum uverbs_attr_type type;
/* Combination of bits from enum UVERBS_ATTR_SPEC_F_XXXX */
u8 flags;
u8 num_elems;
/*
* 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 uverbs_attr_spec_hash {
size_t num_attrs;
unsigned long *mandatory_attrs_bitmask;
struct uverbs_attr_spec attrs[0];
};
struct uverbs_attr_bundle;
struct ib_uverbs_file;
enum {
/*
* Action marked with this flag creates a context (or root for all
* objects).
*/
UVERBS_ACTION_FLAG_CREATE_ROOT = 1U << 0,
};
struct uverbs_method_spec {
/* Combination of bits from enum UVERBS_ACTION_FLAG_XXXX */
u32 flags;
size_t num_buckets;
size_t num_child_attrs;
int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile,
struct uverbs_attr_bundle *ctx);
struct uverbs_attr_spec_hash *attr_buckets[0];
};
struct uverbs_method_spec_hash {
size_t num_methods;
struct uverbs_method_spec *methods[0];
};
struct uverbs_object_spec {
const struct uverbs_obj_type *type_attrs;
size_t num_buckets;
struct uverbs_method_spec_hash *method_buckets[0];
};
struct uverbs_object_spec_hash {
size_t num_objects;
struct uverbs_object_spec *objects[0];
};
struct uverbs_root_spec {
size_t num_buckets;
struct uverbs_object_spec_hash *object_buckets[0];
};
/*
* =======================================
* 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 ib_device *ib_dev, struct ib_uverbs_file *ufile,
struct uverbs_attr_bundle *ctx);
};
struct uverbs_object_def {
u16 id;
const struct uverbs_obj_type *type_attrs;
size_t num_methods;
const struct uverbs_method_def * const (*methods)[];
};
struct uverbs_object_tree_def {
size_t num_objects;
const struct uverbs_object_def * const (*objects)[];
};
#define UA_FLAGS(_flags) .flags = _flags
#define __UVERBS_ATTR0(_id, _type, _fld, _attr, ...) \
((const struct uverbs_attr_def) \
{.id = _id, .attr = {{._fld = {.type = _type, _attr, .flags = 0, } }, } })
#define __UVERBS_ATTR1(_id, _type, _fld, _attr, _extra1, ...) \
((const struct uverbs_attr_def) \
{.id = _id, .attr = {{._fld = {.type = _type, _attr, _extra1 } },} })
#define __UVERBS_ATTR2(_id, _type, _fld, _attr, _extra1, _extra2) \
((const struct uverbs_attr_def) \
{.id = _id, .attr = {{._fld = {.type = _type, _attr, _extra1, _extra2 } },} })
#define __UVERBS_ATTR(_id, _type, _fld, _attr, _extra1, _extra2, _n, ...) \
__UVERBS_ATTR##_n(_id, _type, _fld, _attr, _extra1, _extra2)
#define UVERBS_ATTR_TYPE(_type) \
.min_len = sizeof(_type), .len = sizeof(_type)
#define UVERBS_ATTR_STRUCT(_type, _last) \
.min_len = ((uintptr_t)(&((_type *)0)->_last + 1)), .len = sizeof(_type)
#define UVERBS_ATTR_SIZE(_min_len, _len) \
.min_len = _min_len, .len = _len
/*
* In new compiler, UVERBS_ATTR could be simplified by declaring it as
* [_id] = {.type = _type, .len = _len, ##__VA_ARGS__}
* But since we support older compilers too, we need the more complex code.
*/
#define UVERBS_ATTR(_id, _type, _fld, _attr, ...) \
__UVERBS_ATTR(_id, _type, _fld, _attr, ##__VA_ARGS__, 2, 1, 0)
#define UVERBS_ATTR_PTR_IN_SZ(_id, _len, ...) \
UVERBS_ATTR(_id, UVERBS_ATTR_TYPE_PTR_IN, ptr, _len, ##__VA_ARGS__)
/* If sizeof(_type) <= sizeof(u64), this will be inlined rather than a pointer */
#define UVERBS_ATTR_PTR_IN(_id, _type, ...) \
UVERBS_ATTR_PTR_IN_SZ(_id, _type, ##__VA_ARGS__)
#define UVERBS_ATTR_PTR_OUT_SZ(_id, _len, ...) \
UVERBS_ATTR(_id, UVERBS_ATTR_TYPE_PTR_OUT, ptr, _len, ##__VA_ARGS__)
#define UVERBS_ATTR_PTR_OUT(_id, _type, ...) \
UVERBS_ATTR_PTR_OUT_SZ(_id, _type, ##__VA_ARGS__)
#define UVERBS_ATTR_ENUM_IN(_id, _enum_arr, ...) \
UVERBS_ATTR(_id, UVERBS_ATTR_TYPE_ENUM_IN, enum_def, \
.ids = (_enum_arr), \
.num_elems = ARRAY_SIZE(_enum_arr), ##__VA_ARGS__)
/*
* In new compiler, UVERBS_ATTR_IDR (and FD) could be simplified by declaring
* it as
* {.id = _id, \
* .attr {.type = __obj_class, \
* .obj = {.obj_type = _idr_type, \
* .access = _access \
* }, ##__VA_ARGS__ } }
* But since we support older compilers too, we need the more complex code.
*/
#define ___UVERBS_ATTR_OBJ0(_id, _obj_class, _obj_type, _access, ...)\
((const struct uverbs_attr_def) \
{.id = _id, \
.attr = { {.obj = {.type = _obj_class, .obj_type = _obj_type, \
.access = _access, .flags = 0 } }, } })
#define ___UVERBS_ATTR_OBJ1(_id, _obj_class, _obj_type, _access, _flags)\
((const struct uverbs_attr_def) \
{.id = _id, \
.attr = { {.obj = {.type = _obj_class, .obj_type = _obj_type, \
.access = _access, _flags} }, } })
#define ___UVERBS_ATTR_OBJ(_id, _obj_class, _obj_type, _access, _flags, \
_n, ...) \
___UVERBS_ATTR_OBJ##_n(_id, _obj_class, _obj_type, _access, _flags)
#define __UVERBS_ATTR_OBJ(_id, _obj_class, _obj_type, _access, ...) \
___UVERBS_ATTR_OBJ(_id, _obj_class, _obj_type, _access, \
##__VA_ARGS__, 1, 0)
#define UVERBS_ATTR_IDR(_id, _idr_type, _access, ...) \
__UVERBS_ATTR_OBJ(_id, UVERBS_ATTR_TYPE_IDR, _idr_type, _access,\
##__VA_ARGS__)
#define UVERBS_ATTR_FD(_id, _fd_type, _access, ...) \
__UVERBS_ATTR_OBJ(_id, UVERBS_ATTR_TYPE_FD, _fd_type, \
(_access) + BUILD_BUG_ON_ZERO( \
(_access) != UVERBS_ACCESS_NEW && \
(_access) != UVERBS_ACCESS_READ), \
##__VA_ARGS__)
#define DECLARE_UVERBS_ATTR_SPEC(_name, ...) \
const struct uverbs_attr_def _name = __VA_ARGS__
#define DECLARE_UVERBS_ENUM(_name, ...) \
const struct uverbs_enum_spec _name = { \
.len = ARRAY_SIZE(((struct uverbs_attr_spec[]){__VA_ARGS__})),\
.ids = {__VA_ARGS__}, \
}
#define _UVERBS_METHOD_ATTRS_SZ(...) \
(sizeof((const struct uverbs_attr_def * const []){__VA_ARGS__}) /\
sizeof(const struct uverbs_attr_def *))
#define _UVERBS_METHOD(_id, _handler, _flags, ...) \
((const struct uverbs_method_def) { \
.id = _id, \
.flags = _flags, \
.handler = _handler, \
.num_attrs = _UVERBS_METHOD_ATTRS_SZ(__VA_ARGS__), \
.attrs = &(const struct uverbs_attr_def * const []){__VA_ARGS__} })
#define DECLARE_UVERBS_METHOD(_name, _id, _handler, ...) \
const struct uverbs_method_def _name = \
_UVERBS_METHOD(_id, _handler, 0, ##__VA_ARGS__)
#define DECLARE_UVERBS_CTX_METHOD(_name, _id, _handler, _flags, ...) \
const struct uverbs_method_def _name = \
_UVERBS_METHOD(_id, _handler, \
UVERBS_ACTION_FLAG_CREATE_ROOT, \
##__VA_ARGS__)
#define _UVERBS_OBJECT_METHODS_SZ(...) \
(sizeof((const struct uverbs_method_def * const []){__VA_ARGS__}) / \
sizeof(const struct uverbs_method_def *))
#define _UVERBS_OBJECT(_id, _type_attrs, ...) \
((const struct uverbs_object_def) { \
.id = _id, \
.type_attrs = _type_attrs, \
.num_methods = _UVERBS_OBJECT_METHODS_SZ(__VA_ARGS__), \
.methods = &(const struct uverbs_method_def * const []){__VA_ARGS__} })
#define DECLARE_UVERBS_OBJECT(_name, _id, _type_attrs, ...) \
const struct uverbs_object_def _name = \
_UVERBS_OBJECT(_id, _type_attrs, ##__VA_ARGS__)
#define _UVERBS_TREE_OBJECTS_SZ(...) \
(sizeof((const struct uverbs_object_def * const []){__VA_ARGS__}) / \
sizeof(const struct uverbs_object_def *))
#define _UVERBS_OBJECT_TREE(...) \
((const struct uverbs_object_tree_def) { \
.num_objects = _UVERBS_TREE_OBJECTS_SZ(__VA_ARGS__), \
.objects = &(const struct uverbs_object_def * const []){__VA_ARGS__} })
#define DECLARE_UVERBS_OBJECT_TREE(_name, ...) \
const struct uverbs_object_tree_def _name = \
_UVERBS_OBJECT_TREE(__VA_ARGS__)
/* =================================================
* Parsing infrastructure
* =================================================
*/
struct uverbs_ptr_attr {
u64 data;
u16 len;
/* Combination of bits from enum UVERBS_ATTR_F_XXXX */
u16 flags;
u8 enum_id;
};
struct uverbs_obj_attr {
/* pointer to the kernel descriptor -> type, access, etc */
const struct uverbs_obj_type *type;
struct ib_uobject *uobject;
/* fd or id in idr of this object */
int id;
};
struct uverbs_attr {
/*
* pointer to the user-space given attribute, in order to write the
* new uobject's id or update flags.
*/
struct ib_uverbs_attr __user *uattr;
union {
struct uverbs_ptr_attr ptr_attr;
struct uverbs_obj_attr obj_attr;
};
};
struct uverbs_attr_bundle_hash {
/* if bit i is set, it means attrs[i] contains valid information */
unsigned long *valid_bitmap;
size_t num_attrs;
/*
* arrays of attributes, each element corresponds to the specification
* of the attribute in the same index.
*/
struct uverbs_attr *attrs;
};
struct uverbs_attr_bundle {
size_t num_buckets;
struct uverbs_attr_bundle_hash hash[];
};
static inline bool uverbs_attr_is_valid_in_hash(const struct uverbs_attr_bundle_hash *attrs_hash,
unsigned int idx)
{
return test_bit(idx, attrs_hash->valid_bitmap);
}
static inline bool uverbs_attr_is_valid(const struct uverbs_attr_bundle *attrs_bundle,
unsigned int idx)
{
u16 idx_bucket = idx >> UVERBS_ID_NS_SHIFT;
if (attrs_bundle->num_buckets <= idx_bucket)
return false;
return uverbs_attr_is_valid_in_hash(&attrs_bundle->hash[idx_bucket],
idx & ~UVERBS_ID_NS_MASK);
}
#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)
{
u16 idx_bucket = idx >> UVERBS_ID_NS_SHIFT;
if (!uverbs_attr_is_valid(attrs_bundle, idx))
return ERR_PTR(-ENOENT);
return &attrs_bundle->hash[idx_bucket].attrs[idx & ~UVERBS_ID_NS_MASK];
}
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_copy_to(const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, const void *from, size_t size)
{
const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
u16 flags;
size_t min_size;
if (IS_ERR(attr))
return PTR_ERR(attr);
min_size = min_t(size_t, attr->ptr_attr.len, size);
if (copy_to_user(u64_to_user_ptr(attr->ptr_attr.data), from, min_size))
return -EFAULT;
flags = attr->ptr_attr.flags | UVERBS_ATTR_F_VALID_OUTPUT;
if (put_user(flags, &attr->uattr->flags))
return -EFAULT;
return 0;
}
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 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))
/* =================================================
* Definitions -> Specs infrastructure
* =================================================
*/
/*
* uverbs_alloc_spec_tree - Merges different common and driver specific feature
* into one parsing tree that every uverbs command will be parsed upon.
*
* @num_trees: Number of trees in the array @trees.
* @trees: Array of pointers to tree root definitions to merge. Each such tree
* possibly contains objects, methods and attributes definitions.
*
* Returns:
* uverbs_root_spec *: The root of the merged parsing tree.
* On error, we return an error code. Error is checked via IS_ERR.
*
* The following merges could take place:
* a. Two trees representing the same method with different handler
* -> We take the handler of the tree that its handler != NULL
* and its index in the trees array is greater. The incentive for that
* is that developers are expected to first merge common trees and then
* merge trees that gives specialized the behaviour.
* b. Two trees representing the same object with different
* type_attrs (struct uverbs_obj_type):
* -> We take the type_attrs of the tree that its type_attr != NULL
* and its index in the trees array is greater. This could be used
* in order to override the free function, allocation size, etc.
* c. Two trees representing the same method attribute (same id but possibly
* different attributes):
* -> ERROR (-ENOENT), we believe that's not the programmer's intent.
*
* An object without any methods is considered invalid and will abort the
* function with -ENOENT error.
*/
#if IS_ENABLED(CONFIG_INFINIBAND_USER_ACCESS)
struct uverbs_root_spec *uverbs_alloc_spec_tree(unsigned int num_trees,
const struct uverbs_object_tree_def **trees);
void uverbs_free_spec_tree(struct uverbs_root_spec *root);
#else
static inline struct uverbs_root_spec *uverbs_alloc_spec_tree(unsigned int num_trees,
const struct uverbs_object_tree_def **trees)
{
return NULL;
}
static inline void uverbs_free_spec_tree(struct uverbs_root_spec *root)
{
}
#endif
#endif
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