drivers/infiniband/core/mr_pool.c

   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
   8 struct 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 }
  23 EXPORT_SYMBOL(ib_mr_pool_get);
  24
  25 void 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 }
  34 EXPORT_SYMBOL(ib_mr_pool_put);
  35
  36 int 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;
  60 out:
  61         ib_mr_pool_destroy(qp, list);
  62         return ret;
  63 }
  64 EXPORT_SYMBOL(ib_mr_pool_init);
  65
  66 void 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 }
  82 EXPORT_SYMBOL(ib_mr_pool_destroy);