linux/include/rdma/uverbs_ioctl.h
Matan Barak 5242711294 IB/core: Assign root to all drivers
In order to use the parsing tree, we need to assign the root
to all drivers. Currently, we just assign the default parsing
tree via ib_uverbs_add_one. The driver could override this by
assigning a parsing tree prior to registering the device.

Signed-off-by: Matan Barak <matanb@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-08-31 08:35:14 -04:00

439 lines
14 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>
/*
* =======================================
* 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,
};
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 */
UVERBS_ATTR_SPEC_F_MIN_SZ = 1U << 1,
};
struct uverbs_attr_spec {
enum uverbs_attr_type type;
union {
u16 len;
struct {
/*
* higher bits mean the namespace and lower bits mean
* the type id within the namespace.
*/
u16 obj_type;
u8 access;
} obj;
};
/* Combination of bits from enum UVERBS_ATTR_SPEC_F_XXXX */
u8 flags;
};
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, _len, _type, ...) \
((const struct uverbs_attr_def) \
{.id = _id, .attr = {.type = _type, {.len = _len}, .flags = 0, } })
#define __UVERBS_ATTR1(_id, _len, _type, _flags) \
((const struct uverbs_attr_def) \
{.id = _id, .attr = {.type = _type, {.len = _len}, _flags, } })
#define __UVERBS_ATTR(_id, _len, _type, _flags, _n, ...) \
__UVERBS_ATTR##_n(_id, _len, _type, _flags)
/*
* 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, _len, _type, ...) \
__UVERBS_ATTR(_id, _len, _type, ##__VA_ARGS__, 1, 0)
#define UVERBS_ATTR_PTR_IN_SZ(_id, _len, ...) \
UVERBS_ATTR(_id, _len, UVERBS_ATTR_TYPE_PTR_IN, ##__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, sizeof(_type), ##__VA_ARGS__)
#define UVERBS_ATTR_PTR_OUT_SZ(_id, _len, ...) \
UVERBS_ATTR(_id, _len, UVERBS_ATTR_TYPE_PTR_OUT, ##__VA_ARGS__)
#define UVERBS_ATTR_PTR_OUT(_id, _type, ...) \
UVERBS_ATTR_PTR_OUT_SZ(_id, sizeof(_type), ##__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 = {.type = _obj_class, \
{.obj = {.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 = {.type = _obj_class, \
{.obj = {.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 _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 {
union {
u64 data;
void __user *ptr;
};
u16 len;
/* Combination of bits from enum UVERBS_ATTR_F_XXXX */
u16 flags;
};
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);
}
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_copy_to(const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, const void *from)
{
const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
u16 flags;
if (IS_ERR(attr))
return PTR_ERR(attr);
flags = attr->ptr_attr.flags | UVERBS_ATTR_F_VALID_OUTPUT;
return (!copy_to_user(attr->ptr_attr.ptr, from, attr->ptr_attr.len) &&
!put_user(flags, &attr->uattr->flags)) ? 0 : -EFAULT;
}
static inline int _uverbs_copy_from(void *to, size_t to_size,
const struct uverbs_attr_bundle *attrs_bundle,
size_t idx)
{
const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
if (IS_ERR(attr))
return PTR_ERR(attr);
if (to_size <= sizeof(((struct ib_uverbs_attr *)0)->data))
memcpy(to, &attr->ptr_attr.data, attr->ptr_attr.len);
else if (copy_from_user(to, attr->ptr_attr.ptr, attr->ptr_attr.len))
return -EFAULT;
return 0;
}
#define uverbs_copy_from(to, attrs_bundle, idx) \
_uverbs_copy_from(to, sizeof(*(to)), attrs_bundle, idx)
/* =================================================
* 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