1 /*
2 * Copyright (c) 2016 HGST, a Western Digital Company.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 */
13 #include <rdma/ib_verbs.h>
14 #include <rdma/mr_pool.h>
15
ib_mr_pool_get(struct ib_qp * qp,struct list_head * list)16 struct ib_mr *ib_mr_pool_get(struct ib_qp *qp, struct list_head *list)
17 {
18 struct ib_mr *mr;
19 unsigned long flags;
20
21 spin_lock_irqsave(&qp->mr_lock, flags);
22 mr = list_first_entry_or_null(list, struct ib_mr, qp_entry);
23 if (mr) {
24 list_del(&mr->qp_entry);
25 qp->mrs_used++;
26 }
27 spin_unlock_irqrestore(&qp->mr_lock, flags);
28
29 return mr;
30 }
31 EXPORT_SYMBOL(ib_mr_pool_get);
32
ib_mr_pool_put(struct ib_qp * qp,struct list_head * list,struct ib_mr * mr)33 void ib_mr_pool_put(struct ib_qp *qp, struct list_head *list, struct ib_mr *mr)
34 {
35 unsigned long flags;
36
37 spin_lock_irqsave(&qp->mr_lock, flags);
38 list_add(&mr->qp_entry, list);
39 qp->mrs_used--;
40 spin_unlock_irqrestore(&qp->mr_lock, flags);
41 }
42 EXPORT_SYMBOL(ib_mr_pool_put);
43
ib_mr_pool_init(struct ib_qp * qp,struct list_head * list,int nr,enum ib_mr_type type,u32 max_num_sg)44 int ib_mr_pool_init(struct ib_qp *qp, struct list_head *list, int nr,
45 enum ib_mr_type type, u32 max_num_sg)
46 {
47 struct ib_mr *mr;
48 unsigned long flags;
49 int ret, i;
50
51 for (i = 0; i < nr; i++) {
52 mr = ib_alloc_mr(qp->pd, type, max_num_sg);
53 if (IS_ERR(mr)) {
54 ret = PTR_ERR(mr);
55 goto out;
56 }
57
58 spin_lock_irqsave(&qp->mr_lock, flags);
59 list_add_tail(&mr->qp_entry, list);
60 spin_unlock_irqrestore(&qp->mr_lock, flags);
61 }
62
63 return 0;
64 out:
65 ib_mr_pool_destroy(qp, list);
66 return ret;
67 }
68 EXPORT_SYMBOL(ib_mr_pool_init);
69
ib_mr_pool_destroy(struct ib_qp * qp,struct list_head * list)70 void ib_mr_pool_destroy(struct ib_qp *qp, struct list_head *list)
71 {
72 struct ib_mr *mr;
73 unsigned long flags;
74
75 spin_lock_irqsave(&qp->mr_lock, flags);
76 while (!list_empty(list)) {
77 mr = list_first_entry(list, struct ib_mr, qp_entry);
78 list_del(&mr->qp_entry);
79
80 spin_unlock_irqrestore(&qp->mr_lock, flags);
81 ib_dereg_mr(mr);
82 spin_lock_irqsave(&qp->mr_lock, flags);
83 }
84 spin_unlock_irqrestore(&qp->mr_lock, flags);
85 }
86 EXPORT_SYMBOL(ib_mr_pool_destroy);
87
