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linux-sg2042/drivers/infiniband/core/uverbs_ioctl_merge.c

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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.
*/
#include <rdma/uverbs_ioctl.h>
#include <rdma/rdma_user_ioctl.h>
#include <linux/bitops.h>
#include "uverbs.h"
#define UVERBS_NUM_NS (UVERBS_ID_NS_MASK >> UVERBS_ID_NS_SHIFT)
#define GET_NS_ID(idx) (((idx) & UVERBS_ID_NS_MASK) >> UVERBS_ID_NS_SHIFT)
#define GET_ID(idx) ((idx) & ~UVERBS_ID_NS_MASK)
#define _for_each_element(elem, tmpi, tmpj, hashes, num_buckets_offset, \
buckets_offset) \
for (tmpj = 0, \
elem = (*(const void ***)((hashes)[tmpi] + \
(buckets_offset)))[0]; \
tmpj < *(size_t *)((hashes)[tmpi] + (num_buckets_offset)); \
tmpj++) \
if ((elem = ((*(const void ***)(hashes[tmpi] + \
(buckets_offset)))[tmpj])))
/*
* Iterate all elements of a few @hashes. The number of given hashes is
* indicated by @num_hashes. The offset of the number of buckets in the hash is
* represented by @num_buckets_offset, while the offset of the buckets array in
* the hash structure is represented by @buckets_offset. tmpi and tmpj are two
* short (or int) based indices that are given by the user. tmpi iterates over
* the different hashes. @elem points the current element in the hashes[tmpi]
* bucket we are looping on. To be honest, @hashes representation isn't exactly
* a hash, but more a collection of elements. These elements' ids are treated
* in a hash like manner, where the first upper bits are the bucket number.
* These elements are later mapped into a perfect-hash.
*/
#define for_each_element(elem, tmpi, tmpj, hashes, num_hashes, \
num_buckets_offset, buckets_offset) \
for (tmpi = 0; tmpi < (num_hashes); tmpi++) \
_for_each_element(elem, tmpi, tmpj, hashes, num_buckets_offset,\
buckets_offset)
#define get_elements_iterators_entry_above(iters, num_elements, elements, \
num_objects_fld, objects_fld, bucket,\
min_id) \
get_elements_above_id((const void **)iters, num_elements, \
(const void **)(elements), \
offsetof(typeof(**elements), \
num_objects_fld), \
offsetof(typeof(**elements), objects_fld),\
offsetof(typeof(***(*elements)->objects_fld), id),\
bucket, min_id)
#define get_objects_above_id(iters, num_trees, trees, bucket, min_id) \
get_elements_iterators_entry_above(iters, num_trees, trees, \
num_objects, objects, bucket, min_id)
#define get_methods_above_id(method_iters, num_iters, iters, bucket, min_id)\
get_elements_iterators_entry_above(method_iters, num_iters, iters, \
num_methods, methods, bucket, min_id)
#define get_attrs_above_id(attrs_iters, num_iters, iters, bucket, min_id)\
get_elements_iterators_entry_above(attrs_iters, num_iters, iters, \
num_attrs, attrs, bucket, min_id)
/*
* get_elements_above_id get a few hashes represented by @elements and
* @num_elements. The hashes fields are described by @num_offset, @data_offset
* and @id_offset in the same way as required by for_each_element. The function
* returns an array of @iters, represents an array of elements in the hashes
* buckets, which their ids are the smallest ids in all hashes but are all
* larger than the id given by min_id. Elements are only added to the iters
* array if their id belongs to the bucket @bucket. The number of elements in
* the returned array is returned by the function. @min_id is also updated to
* reflect the new min_id of all elements in iters.
*/
static size_t get_elements_above_id(const void **iters,
unsigned int num_elements,
const void **elements,
size_t num_offset,
size_t data_offset,
size_t id_offset,
u16 bucket,
short *min_id)
{
size_t num_iters = 0;
short min = SHRT_MAX;
const void *elem;
int i, j, last_stored = -1;
for_each_element(elem, i, j, elements, num_elements, num_offset,
data_offset) {
u16 id = *(u16 *)(elem + id_offset);
if (GET_NS_ID(id) != bucket)
continue;
if (GET_ID(id) < *min_id ||
(min != SHRT_MAX && GET_ID(id) > min))
continue;
/*
* We first iterate all hashes represented by @elements. When
* we do, we try to find an element @elem in the bucket @bucket
* which its id is min. Since we can't ensure the user sorted
* the elements in increasing order, we override this hash's
* minimal id element we found, if a new element with a smaller
* id was just found.
*/
iters[last_stored == i ? num_iters - 1 : num_iters++] = elem;
last_stored = i;
min = GET_ID(id);
}
/*
* We only insert to our iters array an element, if its id is smaller
* than all previous ids. Therefore, the final iters array is sorted so
* that smaller ids are in the end of the array.
* Therefore, we need to clean the beginning of the array to make sure
* all ids of final elements are equal to min.
*/
for (i = num_iters - 1; i >= 0 &&
GET_ID(*(u16 *)(iters[i] + id_offset)) == min; i--)
;
num_iters -= i + 1;
memmove(iters, iters + i + 1, sizeof(*iters) * num_iters);
*min_id = min;
return num_iters;
}
#define find_max_element_entry_id(num_elements, elements, num_objects_fld, \
objects_fld, bucket) \
find_max_element_id(num_elements, (const void **)(elements), \
offsetof(typeof(**elements), num_objects_fld), \
offsetof(typeof(**elements), objects_fld), \
offsetof(typeof(***(*elements)->objects_fld), id),\
bucket)
static short find_max_element_ns_id(unsigned int num_elements,
const void **elements,
size_t num_offset,
size_t data_offset,
size_t id_offset)
{
short max_ns = SHRT_MIN;
const void *elem;
int i, j;
for_each_element(elem, i, j, elements, num_elements, num_offset,
data_offset) {
u16 id = *(u16 *)(elem + id_offset);
if (GET_NS_ID(id) > max_ns)
max_ns = GET_NS_ID(id);
}
return max_ns;
}
static short find_max_element_id(unsigned int num_elements,
const void **elements,
size_t num_offset,
size_t data_offset,
size_t id_offset,
u16 bucket)
{
short max_id = SHRT_MIN;
const void *elem;
int i, j;
for_each_element(elem, i, j, elements, num_elements, num_offset,
data_offset) {
u16 id = *(u16 *)(elem + id_offset);
if (GET_NS_ID(id) == bucket &&
GET_ID(id) > max_id)
max_id = GET_ID(id);
}
return max_id;
}
#define find_max_element_entry_id(num_elements, elements, num_objects_fld, \
objects_fld, bucket) \
find_max_element_id(num_elements, (const void **)(elements), \
offsetof(typeof(**elements), num_objects_fld), \
offsetof(typeof(**elements), objects_fld), \
offsetof(typeof(***(*elements)->objects_fld), id),\
bucket)
#define find_max_element_ns_entry_id(num_elements, elements, \
num_objects_fld, objects_fld) \
find_max_element_ns_id(num_elements, (const void **)(elements), \
offsetof(typeof(**elements), num_objects_fld),\
offsetof(typeof(**elements), objects_fld), \
offsetof(typeof(***(*elements)->objects_fld), id))
/*
* find_max_xxxx_ns_id gets a few elements. Each element is described by an id
* which its upper bits represents a namespace. It finds the max namespace. This
* could be used in order to know how many buckets do we need to allocate. If no
* elements exist, SHRT_MIN is returned. Namespace represents here different
* buckets. The common example is "common bucket" and "driver bucket".
*
* find_max_xxxx_id gets a few elements and a bucket. Each element is described
* by an id which its upper bits represent a namespace. It returns the max id
* which is contained in the same namespace defined in @bucket. This could be
* used in order to know how many elements do we need to allocate in the bucket.
* If no elements exist, SHRT_MIN is returned.
*/
#define find_max_object_id(num_trees, trees, bucket) \
find_max_element_entry_id(num_trees, trees, num_objects,\
objects, bucket)
#define find_max_object_ns_id(num_trees, trees) \
find_max_element_ns_entry_id(num_trees, trees, \
num_objects, objects)
#define find_max_method_id(num_iters, iters, bucket) \
find_max_element_entry_id(num_iters, iters, num_methods,\
methods, bucket)
#define find_max_method_ns_id(num_iters, iters) \
find_max_element_ns_entry_id(num_iters, iters, \
num_methods, methods)
#define find_max_attr_id(num_iters, iters, bucket) \
find_max_element_entry_id(num_iters, iters, num_attrs, \
attrs, bucket)
#define find_max_attr_ns_id(num_iters, iters) \
find_max_element_ns_entry_id(num_iters, iters, \
num_attrs, attrs)
static void free_method(struct uverbs_method_spec *method)
{
unsigned int i;
if (!method)
return;
for (i = 0; i < method->num_buckets; i++)
kfree(method->attr_buckets[i]);
kfree(method);
}
#define IS_ATTR_OBJECT(attr) ((attr)->type == UVERBS_ATTR_TYPE_IDR || \
(attr)->type == UVERBS_ATTR_TYPE_FD)
/*
* This function gets array of size @num_method_defs which contains pointers to
* method definitions @method_defs. The function allocates an
* uverbs_method_spec structure and initializes its number of buckets and the
* elements in buckets to the correct attributes. While doing that, it
* validates that there aren't conflicts between attributes of different
* method_defs.
*/
static struct uverbs_method_spec *build_method_with_attrs(const struct uverbs_method_def **method_defs,
size_t num_method_defs)
{
int bucket_idx;
int max_attr_buckets = 0;
size_t num_attr_buckets = 0;
int res = 0;
struct uverbs_method_spec *method = NULL;
const struct uverbs_attr_def **attr_defs;
unsigned int num_of_singularities = 0;
max_attr_buckets = find_max_attr_ns_id(num_method_defs, method_defs);
if (max_attr_buckets >= 0)
num_attr_buckets = max_attr_buckets + 1;
method = kzalloc(sizeof(*method) +
num_attr_buckets * sizeof(*method->attr_buckets),
GFP_KERNEL);
if (!method)
return ERR_PTR(-ENOMEM);
method->num_buckets = num_attr_buckets;
attr_defs = kcalloc(num_method_defs, sizeof(*attr_defs), GFP_KERNEL);
if (!attr_defs) {
res = -ENOMEM;
goto free_method;
}
for (bucket_idx = 0; bucket_idx < method->num_buckets; bucket_idx++) {
short min_id = SHRT_MIN;
int attr_max_bucket = 0;
struct uverbs_attr_spec_hash *hash = NULL;
attr_max_bucket = find_max_attr_id(num_method_defs, method_defs,
bucket_idx);
if (attr_max_bucket < 0)
continue;
hash = kzalloc(sizeof(*hash) +
ALIGN(sizeof(*hash->attrs) * (attr_max_bucket + 1),
sizeof(long)) +
BITS_TO_LONGS(attr_max_bucket) * sizeof(long),
GFP_KERNEL);
if (!hash) {
res = -ENOMEM;
goto free;
}
hash->num_attrs = attr_max_bucket + 1;
method->num_child_attrs += hash->num_attrs;
hash->mandatory_attrs_bitmask = (void *)(hash + 1) +
ALIGN(sizeof(*hash->attrs) *
(attr_max_bucket + 1),
sizeof(long));
method->attr_buckets[bucket_idx] = hash;
do {
size_t num_attr_defs;
struct uverbs_attr_spec *attr;
bool attr_obj_with_special_access;
num_attr_defs =
get_attrs_above_id(attr_defs,
num_method_defs,
method_defs,
bucket_idx,
&min_id);
/* Last attr in bucket */
if (!num_attr_defs)
break;
if (num_attr_defs > 1) {
/*
* We don't allow two attribute definitions for
* the same attribute. This is usually a
* programmer error. If required, it's better to
* just add a new attribute to capture the new
* semantics.
*/
res = -EEXIST;
goto free;
}
attr = &hash->attrs[min_id];
memcpy(attr, &attr_defs[0]->attr, sizeof(*attr));
attr_obj_with_special_access = IS_ATTR_OBJECT(attr) &&
(attr->obj.access == UVERBS_ACCESS_NEW ||
attr->obj.access == UVERBS_ACCESS_DESTROY);
num_of_singularities += !!attr_obj_with_special_access;
if (WARN(num_of_singularities > 1,
"ib_uverbs: Method contains more than one object attr (%d) with new/destroy access\n",
min_id) ||
WARN(attr_obj_with_special_access &&
!(attr->flags & UVERBS_ATTR_SPEC_F_MANDATORY),
"ib_uverbs: Tried to merge attr (%d) but it's an object with new/destroy aceess but isn't mandatory\n",
min_id) ||
WARN(IS_ATTR_OBJECT(attr) &&
attr->flags & UVERBS_ATTR_SPEC_F_MIN_SZ,
"ib_uverbs: Tried to merge attr (%d) but it's an object with min_sz flag\n",
min_id)) {
res = -EINVAL;
goto free;
}
if (attr->flags & UVERBS_ATTR_SPEC_F_MANDATORY)
set_bit(min_id, hash->mandatory_attrs_bitmask);
min_id++;
} while (1);
}
kfree(attr_defs);
return method;
free:
kfree(attr_defs);
free_method:
free_method(method);
return ERR_PTR(res);
}
static void free_object(struct uverbs_object_spec *object)
{
unsigned int i, j;
if (!object)
return;
for (i = 0; i < object->num_buckets; i++) {
struct uverbs_method_spec_hash *method_buckets =
object->method_buckets[i];
if (!method_buckets)
continue;
for (j = 0; j < method_buckets->num_methods; j++)
free_method(method_buckets->methods[j]);
kfree(method_buckets);
}
kfree(object);
}
/*
* This function gets array of size @num_object_defs which contains pointers to
* object definitions @object_defs. The function allocated an
* uverbs_object_spec structure and initialize its number of buckets and the
* elements in buckets to the correct methods. While doing that, it
* sorts out the correct relationship between conflicts in the same method.
*/
static struct uverbs_object_spec *build_object_with_methods(const struct uverbs_object_def **object_defs,
size_t num_object_defs)
{
u16 bucket_idx;
int max_method_buckets = 0;
u16 num_method_buckets = 0;
int res = 0;
struct uverbs_object_spec *object = NULL;
const struct uverbs_method_def **method_defs;
max_method_buckets = find_max_method_ns_id(num_object_defs, object_defs);
if (max_method_buckets >= 0)
num_method_buckets = max_method_buckets + 1;
object = kzalloc(sizeof(*object) +
num_method_buckets *
sizeof(*object->method_buckets), GFP_KERNEL);
if (!object)
return ERR_PTR(-ENOMEM);
object->num_buckets = num_method_buckets;
method_defs = kcalloc(num_object_defs, sizeof(*method_defs), GFP_KERNEL);
if (!method_defs) {
res = -ENOMEM;
goto free_object;
}
for (bucket_idx = 0; bucket_idx < object->num_buckets; bucket_idx++) {
short min_id = SHRT_MIN;
int methods_max_bucket = 0;
struct uverbs_method_spec_hash *hash = NULL;
methods_max_bucket = find_max_method_id(num_object_defs, object_defs,
bucket_idx);
if (methods_max_bucket < 0)
continue;
hash = kzalloc(sizeof(*hash) +
sizeof(*hash->methods) * (methods_max_bucket + 1),
GFP_KERNEL);
if (!hash) {
res = -ENOMEM;
goto free;
}
hash->num_methods = methods_max_bucket + 1;
object->method_buckets[bucket_idx] = hash;
do {
size_t num_method_defs;
struct uverbs_method_spec *method;
int i;
num_method_defs =
get_methods_above_id(method_defs,
num_object_defs,
object_defs,
bucket_idx,
&min_id);
/* Last method in bucket */
if (!num_method_defs)
break;
method = build_method_with_attrs(method_defs,
num_method_defs);
if (IS_ERR(method)) {
res = PTR_ERR(method);
goto free;
}
/*
* The last tree which is given as an argument to the
* merge overrides previous method handler.
* Therefore, we iterate backwards and search for the
* first handler which != NULL. This also defines the
* set of flags used for this handler.
*/
for (i = num_object_defs - 1;
i >= 0 && !method_defs[i]->handler; i--)
;
hash->methods[min_id++] = method;
/* NULL handler isn't allowed */
if (WARN(i < 0,
"ib_uverbs: tried to merge function id %d, but all handlers are NULL\n",
min_id)) {
res = -EINVAL;
goto free;
}
method->handler = method_defs[i]->handler;
method->flags = method_defs[i]->flags;
} while (1);
}
kfree(method_defs);
return object;
free:
kfree(method_defs);
free_object:
free_object(object);
return ERR_PTR(res);
}
void uverbs_free_spec_tree(struct uverbs_root_spec *root)
{
unsigned int i, j;
if (!root)
return;
for (i = 0; i < root->num_buckets; i++) {
struct uverbs_object_spec_hash *object_hash =
root->object_buckets[i];
if (!object_hash)
continue;
for (j = 0; j < object_hash->num_objects; j++)
free_object(object_hash->objects[j]);
kfree(object_hash);
}
kfree(root);
}
EXPORT_SYMBOL(uverbs_free_spec_tree);
struct uverbs_root_spec *uverbs_alloc_spec_tree(unsigned int num_trees,
const struct uverbs_object_tree_def **trees)
{
u16 bucket_idx;
short max_object_buckets = 0;
size_t num_objects_buckets = 0;
struct uverbs_root_spec *root_spec = NULL;
const struct uverbs_object_def **object_defs;
int i;
int res = 0;
max_object_buckets = find_max_object_ns_id(num_trees, trees);
/*
* Devices which don't want to support ib_uverbs, should just allocate
* an empty parsing tree. Every user-space command won't hit any valid
* entry in the parsing tree and thus will fail.
*/
if (max_object_buckets >= 0)
num_objects_buckets = max_object_buckets + 1;
root_spec = kzalloc(sizeof(*root_spec) +
num_objects_buckets * sizeof(*root_spec->object_buckets),
GFP_KERNEL);
if (!root_spec)
return ERR_PTR(-ENOMEM);
root_spec->num_buckets = num_objects_buckets;
object_defs = kcalloc(num_trees, sizeof(*object_defs),
GFP_KERNEL);
if (!object_defs) {
res = -ENOMEM;
goto free_root;
}
for (bucket_idx = 0; bucket_idx < root_spec->num_buckets; bucket_idx++) {
short min_id = SHRT_MIN;
short objects_max_bucket;
struct uverbs_object_spec_hash *hash = NULL;
objects_max_bucket = find_max_object_id(num_trees, trees,
bucket_idx);
if (objects_max_bucket < 0)
continue;
hash = kzalloc(sizeof(*hash) +
sizeof(*hash->objects) * (objects_max_bucket + 1),
GFP_KERNEL);
if (!hash) {
res = -ENOMEM;
goto free;
}
hash->num_objects = objects_max_bucket + 1;
root_spec->object_buckets[bucket_idx] = hash;
do {
size_t num_object_defs;
struct uverbs_object_spec *object;
num_object_defs = get_objects_above_id(object_defs,
num_trees,
trees,
bucket_idx,
&min_id);
/* Last object in bucket */
if (!num_object_defs)
break;
object = build_object_with_methods(object_defs,
num_object_defs);
if (IS_ERR(object)) {
res = PTR_ERR(object);
goto free;
}
/*
* The last tree which is given as an argument to the
* merge overrides previous object's type_attrs.
* Therefore, we iterate backwards and search for the
* first type_attrs which != NULL.
*/
for (i = num_object_defs - 1;
i >= 0 && !object_defs[i]->type_attrs; i--)
;
/*
* NULL is a valid type_attrs. It means an object we
* can't instantiate (like DEVICE).
*/
object->type_attrs = i < 0 ? NULL :
object_defs[i]->type_attrs;
hash->objects[min_id++] = object;
} while (1);
}
kfree(object_defs);
return root_spec;
free:
kfree(object_defs);
free_root:
uverbs_free_spec_tree(root_spec);
return ERR_PTR(res);
}
EXPORT_SYMBOL(uverbs_alloc_spec_tree);
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