mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Shamir Rabinovitch](/assets/img/avatar_default.png)
Helper function to get driver's context out of ib_udata wrapped in uverbs_attr_bundle for user objects or NULL for kernel objects. Signed-off-by: Shamir Rabinovitch <shamir.rabinovitch@oracle.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
958 lines
31 KiB
C
958 lines
31 KiB
C
/*
|
|
* 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,
|
|
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 = 24,
|
|
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(((struct ib_device_ops *)0)->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(((struct ib_device_ops *)0)->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(((uintptr_t)(&((_type *)0)->_last + 1)), \
|
|
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;
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
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
|