1// SPDX-License-Identifier: GPL-2.0+
2/* Microchip Sparx5 Switch driver
3 *
4 * Copyright (c) 2023 Microchip Technology Inc. and its subsidiaries.
5 */
6
7#include "sparx5_main_regs.h"
8#include "sparx5_main.h"
9
10static u32 sparx5_pool_id_to_idx(u32 id)
11{
12 return --id;
13}
14
15u32 sparx5_pool_idx_to_id(u32 idx)
16{
17 return ++idx;
18}
19
20/* Release resource from pool.
21 * Return reference count on success, otherwise return error.
22 */
23int sparx5_pool_put(struct sparx5_pool_entry *pool, int size, u32 id)
24{
25 struct sparx5_pool_entry *e_itr;
26
27 e_itr = (pool + sparx5_pool_id_to_idx(id));
28 if (e_itr->ref_cnt == 0)
29 return -EINVAL;
30
31 return --e_itr->ref_cnt;
32}
33
34/* Get resource from pool.
35 * Return reference count on success, otherwise return error.
36 */
37int sparx5_pool_get(struct sparx5_pool_entry *pool, int size, u32 *id)
38{
39 struct sparx5_pool_entry *e_itr;
40 int i;
41
42 for (i = 0, e_itr = pool; i < size; i++, e_itr++) {
43 if (e_itr->ref_cnt == 0) {
44 *id = sparx5_pool_idx_to_id(idx: i);
45 return ++e_itr->ref_cnt;
46 }
47 }
48
49 return -ENOSPC;
50}
51
52/* Get resource from pool that matches index.
53 * Return reference count on success, otherwise return error.
54 */
55int sparx5_pool_get_with_idx(struct sparx5_pool_entry *pool, int size, u32 idx,
56 u32 *id)
57{
58 struct sparx5_pool_entry *e_itr;
59 int i, ret = -ENOSPC;
60
61 for (i = 0, e_itr = pool; i < size; i++, e_itr++) {
62 /* Pool index of first free entry */
63 if (e_itr->ref_cnt == 0 && ret == -ENOSPC)
64 ret = i;
65 /* Tc index already in use ? */
66 if (e_itr->idx == idx && e_itr->ref_cnt > 0) {
67 ret = i;
68 break;
69 }
70 }
71
72 /* Did we find a free entry? */
73 if (ret >= 0) {
74 *id = sparx5_pool_idx_to_id(idx: ret);
75 e_itr = (pool + ret);
76 e_itr->idx = idx;
77 return ++e_itr->ref_cnt;
78 }
79
80 return ret;
81}
82

source code of linux/drivers/net/ethernet/microchip/sparx5/sparx5_pool.c