diff options
Diffstat (limited to 'drivers/infiniband/core/uverbs_ioctl_merge.c')
| -rw-r--r-- | drivers/infiniband/core/uverbs_ioctl_merge.c | 665 |
1 files changed, 665 insertions, 0 deletions
diff --git a/drivers/infiniband/core/uverbs_ioctl_merge.c b/drivers/infiniband/core/uverbs_ioctl_merge.c new file mode 100644 index 000000000000..76ddb6564578 --- /dev/null +++ b/drivers/infiniband/core/uverbs_ioctl_merge.c @@ -0,0 +1,665 @@ +/* + * 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); |