1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2016 HGST, a Western Digital Company.
4 */
5#include <rdma/ib_verbs.h>
6#include <rdma/mr_pool.h>
7
8struct ib_mr *ib_mr_pool_get(struct ib_qp *qp, struct list_head *list)
9{
10	struct ib_mr *mr;
11	unsigned long flags;
12
13	spin_lock_irqsave(&qp->mr_lock, flags);
14	mr = list_first_entry_or_null(list, struct ib_mr, qp_entry);
15	if (mr) {
16		list_del(&mr->qp_entry);
17		qp->mrs_used++;
18	}
19	spin_unlock_irqrestore(&qp->mr_lock, flags);
20
21	return mr;
22}
23EXPORT_SYMBOL(ib_mr_pool_get);
24
25void ib_mr_pool_put(struct ib_qp *qp, struct list_head *list, struct ib_mr *mr)
26{
27	unsigned long flags;
28
29	spin_lock_irqsave(&qp->mr_lock, flags);
30	list_add(&mr->qp_entry, list);
31	qp->mrs_used--;
32	spin_unlock_irqrestore(&qp->mr_lock, flags);
33}
34EXPORT_SYMBOL(ib_mr_pool_put);
35
36int ib_mr_pool_init(struct ib_qp *qp, struct list_head *list, int nr,
37		enum ib_mr_type type, u32 max_num_sg, u32 max_num_meta_sg)
38{
39	struct ib_mr *mr;
40	unsigned long flags;
41	int ret, i;
42
43	for (i = 0; i < nr; i++) {
44		if (type == IB_MR_TYPE_INTEGRITY)
45			mr = ib_alloc_mr_integrity(qp->pd, max_num_sg,
46						   max_num_meta_sg);
47		else
48			mr = ib_alloc_mr(qp->pd, type, max_num_sg);
49		if (IS_ERR(mr)) {
50			ret = PTR_ERR(mr);
51			goto out;
52		}
53
54		spin_lock_irqsave(&qp->mr_lock, flags);
55		list_add_tail(&mr->qp_entry, list);
56		spin_unlock_irqrestore(&qp->mr_lock, flags);
57	}
58
59	return 0;
60out:
61	ib_mr_pool_destroy(qp, list);
62	return ret;
63}
64EXPORT_SYMBOL(ib_mr_pool_init);
65
66void ib_mr_pool_destroy(struct ib_qp *qp, struct list_head *list)
67{
68	struct ib_mr *mr;
69	unsigned long flags;
70
71	spin_lock_irqsave(&qp->mr_lock, flags);
72	while (!list_empty(list)) {
73		mr = list_first_entry(list, struct ib_mr, qp_entry);
74		list_del(&mr->qp_entry);
75
76		spin_unlock_irqrestore(&qp->mr_lock, flags);
77		ib_dereg_mr(mr);
78		spin_lock_irqsave(&qp->mr_lock, flags);
79	}
80	spin_unlock_irqrestore(&qp->mr_lock, flags);
81}
82EXPORT_SYMBOL(ib_mr_pool_destroy);
83