drivers/infiniband/hw/hfi1/exp_rcv.c

   1 /*
   2  * Copyright(c) 2017 Intel Corporation.
   3  *
   4  * This file is provided under a dual BSD/GPLv2 license.  When using or
   5  * redistributing this file, you may do so under either license.
   6  *
   7  * GPL LICENSE SUMMARY
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of version 2 of the GNU General Public License as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * BSD LICENSE
  19  *
  20  * Redistribution and use in source and binary forms, with or without
  21  * modification, are permitted provided that the following conditions
  22  * are met:
  23  *
  24  *  - Redistributions of source code must retain the above copyright
  25  *    notice, this list of conditions and the following disclaimer.
  26  *  - Redistributions in binary form must reproduce the above copyright
  27  *    notice, this list of conditions and the following disclaimer in
  28  *    the documentation and/or other materials provided with the
  29  *    distribution.
  30  *  - Neither the name of Intel Corporation nor the names of its
  31  *    contributors may be used to endorse or promote products derived
  32  *    from this software without specific prior written permission.
  33  *
  34  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  35  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  36  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  37  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  38  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  39  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  40  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  41  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  42  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  43  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  44  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  45  *
  46  */
  47
  48 #include "exp_rcv.h"
  49 #include "trace.h"
  50
  51 /**
  52  * exp_tid_group_init - initialize exp_tid_set
  53  * @set - the set
  54  */
  55 void hfi1_exp_tid_group_init(struct exp_tid_set *set)
  56 {
  57         INIT_LIST_HEAD(&set->list);
  58         set->count = 0;
  59 }
  60
  61 /**
  62  * alloc_ctxt_rcv_groups - initialize expected receive groups
  63  * @rcd - the context to add the groupings to
  64  */
  65 int hfi1_alloc_ctxt_rcv_groups(struct hfi1_ctxtdata *rcd)
  66 {
  67         struct hfi1_devdata *dd = rcd->dd;
  68         u32 tidbase;
  69         struct tid_group *grp;
  70         int i;
  71
  72         tidbase = rcd->expected_base;
  73         for (i = 0; i < rcd->expected_count /
  74                      dd->rcv_entries.group_size; i++) {
  75                 grp = kzalloc(sizeof(*grp), GFP_KERNEL);
  76                 if (!grp)
  77                         goto bail;
  78                 grp->size = dd->rcv_entries.group_size;
  79                 grp->base = tidbase;
  80                 tid_group_add_tail(grp, &rcd->tid_group_list);
  81                 tidbase += dd->rcv_entries.group_size;
  82         }
  83
  84         return 0;
  85 bail:
  86         hfi1_free_ctxt_rcv_groups(rcd);
  87         return -ENOMEM;
  88 }
  89
  90 /**
  91  * free_ctxt_rcv_groups - free  expected receive groups
  92  * @rcd - the context to free
  93  *
  94  * The routine dismantles the expect receive linked
  95  * list and clears any tids associated with the receive
  96  * context.
  97  *
  98  * This should only be called for kernel contexts and the
  99  * a base user context.
 100  */
 101 void hfi1_free_ctxt_rcv_groups(struct hfi1_ctxtdata *rcd)
 102 {
 103         struct tid_group *grp, *gptr;
 104
 105         WARN_ON(!EXP_TID_SET_EMPTY(rcd->tid_full_list));
 106         WARN_ON(!EXP_TID_SET_EMPTY(rcd->tid_used_list));
 107
 108         list_for_each_entry_safe(grp, gptr, &rcd->tid_group_list.list, list) {
 109                 tid_group_remove(grp, &rcd->tid_group_list);
 110                 kfree(grp);
 111         }
 112
 113         hfi1_clear_tids(rcd);
 114 }