forked from Minki/linux
87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
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/*
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* Copyright (c) 2016 HGST, a Western Digital Company.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <rdma/ib_verbs.h>
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#include <rdma/mr_pool.h>
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struct ib_mr *ib_mr_pool_get(struct ib_qp *qp, struct list_head *list)
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{
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struct ib_mr *mr;
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unsigned long flags;
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spin_lock_irqsave(&qp->mr_lock, flags);
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mr = list_first_entry_or_null(list, struct ib_mr, qp_entry);
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if (mr) {
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list_del(&mr->qp_entry);
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qp->mrs_used++;
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}
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spin_unlock_irqrestore(&qp->mr_lock, flags);
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return mr;
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}
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EXPORT_SYMBOL(ib_mr_pool_get);
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void ib_mr_pool_put(struct ib_qp *qp, struct list_head *list, struct ib_mr *mr)
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{
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unsigned long flags;
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spin_lock_irqsave(&qp->mr_lock, flags);
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list_add(&mr->qp_entry, list);
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qp->mrs_used--;
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spin_unlock_irqrestore(&qp->mr_lock, flags);
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}
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EXPORT_SYMBOL(ib_mr_pool_put);
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int ib_mr_pool_init(struct ib_qp *qp, struct list_head *list, int nr,
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enum ib_mr_type type, u32 max_num_sg)
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{
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struct ib_mr *mr;
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unsigned long flags;
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int ret, i;
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for (i = 0; i < nr; i++) {
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mr = ib_alloc_mr(qp->pd, type, max_num_sg);
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if (IS_ERR(mr)) {
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ret = PTR_ERR(mr);
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goto out;
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}
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spin_lock_irqsave(&qp->mr_lock, flags);
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list_add_tail(&mr->qp_entry, list);
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spin_unlock_irqrestore(&qp->mr_lock, flags);
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}
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return 0;
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out:
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ib_mr_pool_destroy(qp, list);
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return ret;
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}
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EXPORT_SYMBOL(ib_mr_pool_init);
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void ib_mr_pool_destroy(struct ib_qp *qp, struct list_head *list)
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{
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struct ib_mr *mr;
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unsigned long flags;
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spin_lock_irqsave(&qp->mr_lock, flags);
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while (!list_empty(list)) {
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mr = list_first_entry(list, struct ib_mr, qp_entry);
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list_del(&mr->qp_entry);
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spin_unlock_irqrestore(&qp->mr_lock, flags);
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ib_dereg_mr(mr);
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spin_lock_irqsave(&qp->mr_lock, flags);
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}
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spin_unlock_irqrestore(&qp->mr_lock, flags);
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}
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EXPORT_SYMBOL(ib_mr_pool_destroy);
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