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/*
* Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
* Copyright (c) 2015 System Fabric Works, 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 RXE_POOL_H
#define RXE_POOL_H
#define RXE_POOL_ALIGN (16)
#define RXE_POOL_CACHE_FLAGS (0)
enum rxe_pool_flags {
RXE_POOL_ATOMIC = BIT(0),
RXE_POOL_INDEX = BIT(1),
RXE_POOL_KEY = BIT(2),
};
enum rxe_elem_type {
RXE_TYPE_UC,
RXE_TYPE_PD,
RXE_TYPE_AH,
RXE_TYPE_SRQ,
RXE_TYPE_QP,
RXE_TYPE_CQ,
RXE_TYPE_MR,
RXE_TYPE_MW,
RXE_TYPE_MC_GRP,
RXE_TYPE_MC_ELEM,
RXE_NUM_TYPES, /* keep me last */
};
struct rxe_pool_entry;
struct rxe_type_info {
const char *name;
size_t size;
void (*cleanup)(struct rxe_pool_entry *obj);
enum rxe_pool_flags flags;
u32 max_index;
u32 min_index;
size_t key_offset;
size_t key_size;
struct kmem_cache *cache;
};
extern struct rxe_type_info rxe_type_info[];
enum rxe_pool_state {
RXE_POOL_STATE_INVALID,
RXE_POOL_STATE_VALID,
};
struct rxe_pool_entry {
struct rxe_pool *pool;
struct kref ref_cnt;
struct list_head list;
/* only used if indexed or keyed */
struct rb_node node;
u32 index;
};
struct rxe_pool {
struct rxe_dev *rxe;
rwlock_t pool_lock; /* protects pool add/del/search */
size_t elem_size;
struct kref ref_cnt;
void (*cleanup)(struct rxe_pool_entry *obj);
enum rxe_pool_state state;
enum rxe_pool_flags flags;
enum rxe_elem_type type;
unsigned int max_elem;
atomic_t num_elem;
/* only used if indexed or keyed */
struct rb_root tree;
unsigned long *table;
size_t table_size;
u32 max_index;
u32 min_index;
u32 last;
size_t key_offset;
size_t key_size;
};
/* initialize slab caches for managed objects */
int rxe_cache_init(void);
/* cleanup slab caches for managed objects */
void rxe_cache_exit(void);
/* initialize a pool of objects with given limit on
* number of elements. gets parameters from rxe_type_info
* pool elements will be allocated out of a slab cache
*/
int rxe_pool_init(struct rxe_dev *rxe, struct rxe_pool *pool,
enum rxe_elem_type type, u32 max_elem);
/* free resources from object pool */
int rxe_pool_cleanup(struct rxe_pool *pool);
/* allocate an object from pool */
void *rxe_alloc(struct rxe_pool *pool);
/* assign an index to an indexed object and insert object into
* pool's rb tree
*/
void rxe_add_index(void *elem);
/* drop an index and remove object from rb tree */
void rxe_drop_index(void *elem);
/* assign a key to a keyed object and insert object into
* pool's rb tree
*/
void rxe_add_key(void *elem, void *key);
/* remove elem from rb tree */
void rxe_drop_key(void *elem);
/* lookup an indexed object from index. takes a reference on object */
void *rxe_pool_get_index(struct rxe_pool *pool, u32 index);
/* lookup keyed object from key. takes a reference on the object */
void *rxe_pool_get_key(struct rxe_pool *pool, void *key);
/* cleanup an object when all references are dropped */
void rxe_elem_release(struct kref *kref);
/* take a reference on an object */
#define rxe_add_ref(elem) kref_get(&(elem)->pelem.ref_cnt)
/* drop a reference on an object */
#define rxe_drop_ref(elem) kref_put(&(elem)->pelem.ref_cnt, rxe_elem_release)
#endif /* RXE_POOL_H */
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