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/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
/*
* Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
* Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
*/
#ifndef RXE_POOL_H
#define RXE_POOL_H
enum rxe_pool_flags {
RXE_POOL_INDEX = BIT(1),
RXE_POOL_ALLOC = 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_NUM_TYPES, /* keep me last */
};
struct rxe_pool_elem {
struct rxe_pool *pool;
void *obj;
struct kref ref_cnt;
struct list_head list;
/* only used if indexed */
struct rb_node index_node;
u32 index;
};
struct rxe_pool {
struct rxe_dev *rxe;
const char *name;
rwlock_t pool_lock; /* protects pool add/del/search */
void (*cleanup)(struct rxe_pool_elem *obj);
enum rxe_pool_flags flags;
enum rxe_elem_type type;
unsigned int max_elem;
atomic_t num_elem;
size_t elem_size;
size_t elem_offset;
/* only used if indexed */
struct {
struct rb_root tree;
unsigned long *table;
u32 last;
u32 max_index;
u32 min_index;
} index;
};
/* 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 */
void rxe_pool_cleanup(struct rxe_pool *pool);
/* allocate an object from pool */
void *rxe_alloc(struct rxe_pool *pool);
/* connect already allocated object to pool */
int __rxe_add_to_pool(struct rxe_pool *pool, struct rxe_pool_elem *elem);
#define rxe_add_to_pool(pool, obj) __rxe_add_to_pool(pool, &(obj)->elem)
/* assign an index to an indexed object and insert object into
* pool's rb tree
*/
int __rxe_add_index(struct rxe_pool_elem *elem);
#define rxe_add_index(obj) __rxe_add_index(&(obj)->elem)
/* drop an index and remove object from rb tree */
void __rxe_drop_index(struct rxe_pool_elem *elem);
#define rxe_drop_index(obj) __rxe_drop_index(&(obj)->elem)
/* lookup an indexed object from index. takes a reference on object */
void *rxe_pool_get_index(struct rxe_pool *pool, u32 index);
/* 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(obj) kref_get(&(obj)->elem.ref_cnt)
/* drop a reference on an object */
#define rxe_drop_ref(obj) kref_put(&(obj)->elem.ref_cnt, rxe_elem_release)
#define rxe_read_ref(obj) kref_read(&(obj)->elem.ref_cnt)
#endif /* RXE_POOL_H */
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