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
16struct 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}
31EXPORT_SYMBOL(ib_mr_pool_get);
32
33void 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}
42EXPORT_SYMBOL(ib_mr_pool_put);
43
44int 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;
64out:
65	ib_mr_pool_destroy(qp, list);
66	return ret;
67}
68EXPORT_SYMBOL(ib_mr_pool_init);
69
70void 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}
86EXPORT_SYMBOL(ib_mr_pool_destroy);