![Jason Gunthorpe](/assets/img/avatar_default.png)
Instead of using a complex cascade of macros, just directly provide the initializer list each of the declarations is trying to create. Now that the macros are simplified this also reworks the uverbs_attr_spec to be friendly to older compilers by eliminating any unnamed structures/unions inside, and removing the duplication of some fields. The structure size remains at 16 bytes which was the original motivation for some of this oddness. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
578 lines
18 KiB
C
578 lines
18 KiB
C
/*
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* Copyright (c) 2017, Mellanox Technologies inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef _UVERBS_IOCTL_
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#define _UVERBS_IOCTL_
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#include <rdma/uverbs_types.h>
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#include <linux/uaccess.h>
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#include <rdma/rdma_user_ioctl.h>
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#include <rdma/ib_user_ioctl_verbs.h>
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#include <rdma/ib_user_ioctl_cmds.h>
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/*
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* =======================================
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* Verbs action specifications
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* =======================================
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*/
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enum uverbs_attr_type {
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UVERBS_ATTR_TYPE_NA,
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UVERBS_ATTR_TYPE_PTR_IN,
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UVERBS_ATTR_TYPE_PTR_OUT,
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UVERBS_ATTR_TYPE_IDR,
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UVERBS_ATTR_TYPE_FD,
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UVERBS_ATTR_TYPE_ENUM_IN,
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};
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enum uverbs_obj_access {
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UVERBS_ACCESS_READ,
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UVERBS_ACCESS_WRITE,
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UVERBS_ACCESS_NEW,
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UVERBS_ACCESS_DESTROY
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};
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enum {
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UVERBS_ATTR_SPEC_F_MANDATORY = 1U << 0,
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/* Support extending attributes by length, validate all unknown size == zero */
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UVERBS_ATTR_SPEC_F_MIN_SZ_OR_ZERO = 1U << 1,
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/*
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* Valid only for PTR_IN. Allocate and copy the data inside the parser
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*/
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UVERBS_ATTR_SPEC_F_ALLOC_AND_COPY = 1U << 2,
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};
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/* Specification of a single attribute inside the ioctl message */
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struct uverbs_attr_spec {
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u8 type;
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u8 flags;
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union {
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struct {
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/* Current known size to kernel */
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u16 len;
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/* User isn't allowed to provide something < min_len */
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u16 min_len;
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} ptr;
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struct {
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/*
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* higher bits mean the namespace and lower bits mean
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* the type id within the namespace.
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*/
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u16 obj_type;
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u8 access;
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} obj;
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struct {
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u8 num_elems;
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} enum_def;
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} u;
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/* This weird split of the enum lets us remove some padding */
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union {
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struct {
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/*
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* The enum attribute can select one of the attributes
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* contained in the ids array. Currently only PTR_IN
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* attributes are supported in the ids array.
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*/
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const struct uverbs_attr_spec *ids;
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} enum_def;
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} u2;
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};
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struct uverbs_attr_spec_hash {
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size_t num_attrs;
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unsigned long *mandatory_attrs_bitmask;
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struct uverbs_attr_spec attrs[0];
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};
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struct uverbs_attr_bundle;
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struct ib_uverbs_file;
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enum {
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/*
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* Action marked with this flag creates a context (or root for all
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* objects).
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*/
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UVERBS_ACTION_FLAG_CREATE_ROOT = 1U << 0,
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};
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struct uverbs_method_spec {
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/* Combination of bits from enum UVERBS_ACTION_FLAG_XXXX */
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u32 flags;
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size_t num_buckets;
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size_t num_child_attrs;
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int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile,
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struct uverbs_attr_bundle *ctx);
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struct uverbs_attr_spec_hash *attr_buckets[0];
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};
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struct uverbs_method_spec_hash {
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size_t num_methods;
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struct uverbs_method_spec *methods[0];
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};
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struct uverbs_object_spec {
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const struct uverbs_obj_type *type_attrs;
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size_t num_buckets;
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struct uverbs_method_spec_hash *method_buckets[0];
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};
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struct uverbs_object_spec_hash {
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size_t num_objects;
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struct uverbs_object_spec *objects[0];
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};
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struct uverbs_root_spec {
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size_t num_buckets;
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struct uverbs_object_spec_hash *object_buckets[0];
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};
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/*
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* =======================================
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* Verbs definitions
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* =======================================
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*/
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struct uverbs_attr_def {
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u16 id;
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struct uverbs_attr_spec attr;
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};
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struct uverbs_method_def {
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u16 id;
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/* Combination of bits from enum UVERBS_ACTION_FLAG_XXXX */
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u32 flags;
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size_t num_attrs;
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const struct uverbs_attr_def * const (*attrs)[];
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int (*handler)(struct ib_device *ib_dev, struct ib_uverbs_file *ufile,
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struct uverbs_attr_bundle *ctx);
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};
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struct uverbs_object_def {
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u16 id;
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const struct uverbs_obj_type *type_attrs;
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size_t num_methods;
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const struct uverbs_method_def * const (*methods)[];
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};
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struct uverbs_object_tree_def {
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size_t num_objects;
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const struct uverbs_object_def * const (*objects)[];
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};
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/*
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* =======================================
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* Attribute Specifications
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* =======================================
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*/
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/* Use in the _type parameter for attribute specifications */
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#define UVERBS_ATTR_TYPE(_type) \
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.u.ptr.min_len = sizeof(_type), .u.ptr.len = sizeof(_type)
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#define UVERBS_ATTR_STRUCT(_type, _last) \
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.u.ptr.min_len = ((uintptr_t)(&((_type *)0)->_last + 1)), .u.ptr.len = sizeof(_type)
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#define UVERBS_ATTR_SIZE(_min_len, _len) \
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.u.ptr.min_len = _min_len, .u.ptr.len = _len
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#define UVERBS_ATTR_MIN_SIZE(_min_len) \
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UVERBS_ATTR_SIZE(_min_len, USHRT_MAX)
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/* Must be used in the '...' of any UVERBS_ATTR */
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#define UA_FLAGS(_flags) .flags = _flags
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#define UVERBS_ATTR_IDR(_attr_id, _idr_type, _access, ...) \
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((const struct uverbs_attr_def){ \
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.id = _attr_id, \
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.attr = { .type = UVERBS_ATTR_TYPE_IDR, \
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.u.obj.obj_type = _idr_type, \
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.u.obj.access = _access, \
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__VA_ARGS__ } })
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#define UVERBS_ATTR_FD(_attr_id, _fd_type, _access, ...) \
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((const struct uverbs_attr_def){ \
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.id = (_attr_id) + \
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BUILD_BUG_ON_ZERO((_access) != UVERBS_ACCESS_NEW && \
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(_access) != UVERBS_ACCESS_READ), \
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.attr = { .type = UVERBS_ATTR_TYPE_FD, \
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.u.obj.obj_type = _fd_type, \
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.u.obj.access = _access, \
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__VA_ARGS__ } })
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#define UVERBS_ATTR_PTR_IN(_attr_id, _type, ...) \
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((const struct uverbs_attr_def){ \
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.id = _attr_id, \
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.attr = { .type = UVERBS_ATTR_TYPE_PTR_IN, \
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_type, \
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__VA_ARGS__ } })
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#define UVERBS_ATTR_PTR_OUT(_attr_id, _type, ...) \
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((const struct uverbs_attr_def){ \
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.id = _attr_id, \
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.attr = { .type = UVERBS_ATTR_TYPE_PTR_OUT, \
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_type, \
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__VA_ARGS__ } })
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/* _enum_arry should be a 'static const union uverbs_attr_spec[]' */
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#define UVERBS_ATTR_ENUM_IN(_attr_id, _enum_arr, ...) \
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((const struct uverbs_attr_def){ \
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.id = _attr_id, \
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.attr = { .type = UVERBS_ATTR_TYPE_ENUM_IN, \
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.u2.enum_def.ids = _enum_arr, \
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.u.enum_def.num_elems = ARRAY_SIZE(_enum_arr), \
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__VA_ARGS__ }, \
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})
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/*
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* =======================================
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* Declaration helpers
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* =======================================
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*/
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#define _UVERBS_METHOD_ATTRS_SZ(...) \
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(sizeof((const struct uverbs_attr_def * const []){__VA_ARGS__}) /\
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sizeof(const struct uverbs_attr_def *))
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#define _UVERBS_METHOD(_id, _handler, _flags, ...) \
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((const struct uverbs_method_def) { \
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.id = _id, \
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.flags = _flags, \
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.handler = _handler, \
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.num_attrs = _UVERBS_METHOD_ATTRS_SZ(__VA_ARGS__), \
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.attrs = &(const struct uverbs_attr_def * const []){__VA_ARGS__} })
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#define DECLARE_UVERBS_METHOD(_name, _id, _handler, ...) \
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const struct uverbs_method_def _name = \
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_UVERBS_METHOD(_id, _handler, 0, ##__VA_ARGS__)
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#define DECLARE_UVERBS_CTX_METHOD(_name, _id, _handler, _flags, ...) \
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const struct uverbs_method_def _name = \
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_UVERBS_METHOD(_id, _handler, \
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UVERBS_ACTION_FLAG_CREATE_ROOT, \
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##__VA_ARGS__)
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#define _UVERBS_OBJECT_METHODS_SZ(...) \
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(sizeof((const struct uverbs_method_def * const []){__VA_ARGS__}) / \
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sizeof(const struct uverbs_method_def *))
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#define _UVERBS_OBJECT(_id, _type_attrs, ...) \
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((const struct uverbs_object_def) { \
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.id = _id, \
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.type_attrs = _type_attrs, \
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.num_methods = _UVERBS_OBJECT_METHODS_SZ(__VA_ARGS__), \
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.methods = &(const struct uverbs_method_def * const []){__VA_ARGS__} })
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#define DECLARE_UVERBS_OBJECT(_name, _id, _type_attrs, ...) \
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const struct uverbs_object_def _name = \
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_UVERBS_OBJECT(_id, _type_attrs, ##__VA_ARGS__)
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#define _UVERBS_TREE_OBJECTS_SZ(...) \
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(sizeof((const struct uverbs_object_def * const []){__VA_ARGS__}) / \
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sizeof(const struct uverbs_object_def *))
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#define _UVERBS_OBJECT_TREE(...) \
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((const struct uverbs_object_tree_def) { \
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.num_objects = _UVERBS_TREE_OBJECTS_SZ(__VA_ARGS__), \
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.objects = &(const struct uverbs_object_def * const []){__VA_ARGS__} })
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#define DECLARE_UVERBS_OBJECT_TREE(_name, ...) \
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const struct uverbs_object_tree_def _name = \
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_UVERBS_OBJECT_TREE(__VA_ARGS__)
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/* =================================================
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* Parsing infrastructure
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* =================================================
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*/
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struct uverbs_ptr_attr {
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/*
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* If UVERBS_ATTR_SPEC_F_ALLOC_AND_COPY is set then the 'ptr' is
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* used.
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*/
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union {
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void *ptr;
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u64 data;
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};
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u16 len;
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/* Combination of bits from enum UVERBS_ATTR_F_XXXX */
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u16 flags;
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u8 enum_id;
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};
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struct uverbs_obj_attr {
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struct ib_uobject *uobject;
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};
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struct uverbs_attr {
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/*
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* pointer to the user-space given attribute, in order to write the
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* new uobject's id or update flags.
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*/
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struct ib_uverbs_attr __user *uattr;
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union {
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struct uverbs_ptr_attr ptr_attr;
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struct uverbs_obj_attr obj_attr;
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};
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};
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struct uverbs_attr_bundle_hash {
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/* if bit i is set, it means attrs[i] contains valid information */
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unsigned long *valid_bitmap;
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size_t num_attrs;
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/*
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* arrays of attributes, each element corresponds to the specification
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* of the attribute in the same index.
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*/
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struct uverbs_attr *attrs;
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};
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struct uverbs_attr_bundle {
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size_t num_buckets;
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struct uverbs_attr_bundle_hash hash[];
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};
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static inline bool uverbs_attr_is_valid_in_hash(const struct uverbs_attr_bundle_hash *attrs_hash,
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unsigned int idx)
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{
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return test_bit(idx, attrs_hash->valid_bitmap);
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}
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static inline bool uverbs_attr_is_valid(const struct uverbs_attr_bundle *attrs_bundle,
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unsigned int idx)
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{
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u16 idx_bucket = idx >> UVERBS_ID_NS_SHIFT;
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if (attrs_bundle->num_buckets <= idx_bucket)
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return false;
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return uverbs_attr_is_valid_in_hash(&attrs_bundle->hash[idx_bucket],
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idx & ~UVERBS_ID_NS_MASK);
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}
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#define IS_UVERBS_COPY_ERR(_ret) ((_ret) && (_ret) != -ENOENT)
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static inline const struct uverbs_attr *uverbs_attr_get(const struct uverbs_attr_bundle *attrs_bundle,
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u16 idx)
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{
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u16 idx_bucket = idx >> UVERBS_ID_NS_SHIFT;
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if (!uverbs_attr_is_valid(attrs_bundle, idx))
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return ERR_PTR(-ENOENT);
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return &attrs_bundle->hash[idx_bucket].attrs[idx & ~UVERBS_ID_NS_MASK];
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}
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static inline int uverbs_attr_get_enum_id(const struct uverbs_attr_bundle *attrs_bundle,
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u16 idx)
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{
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const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
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if (IS_ERR(attr))
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return PTR_ERR(attr);
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return attr->ptr_attr.enum_id;
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}
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static inline void *uverbs_attr_get_obj(const struct uverbs_attr_bundle *attrs_bundle,
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u16 idx)
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{
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const struct uverbs_attr *attr;
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attr = uverbs_attr_get(attrs_bundle, idx);
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if (IS_ERR(attr))
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return ERR_CAST(attr);
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return attr->obj_attr.uobject->object;
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}
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static inline struct ib_uobject *uverbs_attr_get_uobject(const struct uverbs_attr_bundle *attrs_bundle,
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u16 idx)
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{
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const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
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if (IS_ERR(attr))
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return ERR_CAST(attr);
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return attr->obj_attr.uobject;
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}
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static inline int
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uverbs_attr_get_len(const struct uverbs_attr_bundle *attrs_bundle, u16 idx)
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{
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const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
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if (IS_ERR(attr))
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return PTR_ERR(attr);
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return attr->ptr_attr.len;
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}
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static inline int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle,
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size_t idx, const void *from, size_t size)
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{
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const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
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u16 flags;
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size_t min_size;
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if (IS_ERR(attr))
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return PTR_ERR(attr);
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min_size = min_t(size_t, attr->ptr_attr.len, size);
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if (copy_to_user(u64_to_user_ptr(attr->ptr_attr.data), from, min_size))
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return -EFAULT;
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flags = attr->ptr_attr.flags | UVERBS_ATTR_F_VALID_OUTPUT;
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if (put_user(flags, &attr->uattr->flags))
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return -EFAULT;
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return 0;
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}
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static inline bool uverbs_attr_ptr_is_inline(const struct uverbs_attr *attr)
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{
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return attr->ptr_attr.len <= sizeof(attr->ptr_attr.data);
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}
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static inline void *uverbs_attr_get_alloced_ptr(
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const struct uverbs_attr_bundle *attrs_bundle, u16 idx)
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{
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const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
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if (IS_ERR(attr))
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return (void *)attr;
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return uverbs_attr_ptr_is_inline(attr) ? (void *)&attr->ptr_attr.data :
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attr->ptr_attr.ptr;
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}
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static inline int _uverbs_copy_from(void *to,
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const struct uverbs_attr_bundle *attrs_bundle,
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size_t idx,
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size_t size)
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{
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const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
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if (IS_ERR(attr))
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return PTR_ERR(attr);
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/*
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* Validation ensures attr->ptr_attr.len >= size. If the caller is
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* using UVERBS_ATTR_SPEC_F_MIN_SZ_OR_ZERO then it must call
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* uverbs_copy_from_or_zero.
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*/
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if (unlikely(size < attr->ptr_attr.len))
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return -EINVAL;
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if (uverbs_attr_ptr_is_inline(attr))
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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
|