linux/net/batman-adv/ring_buffer.c
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   1/* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
   2 *
   3 * Marek Lindner
   4 *
   5 * This program is free software; you can redistribute it and/or
   6 * modify it under the terms of version 2 of the GNU General Public
   7 * License as published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it will be useful, but
  10 * WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12 * General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write to the Free Software
  16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17 * 02110-1301, USA
  18 */
  19
  20#include "main.h"
  21#include "ring_buffer.h"
  22
  23void batadv_ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index,
  24                            uint8_t value)
  25{
  26        lq_recv[*lq_index] = value;
  27        *lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE;
  28}
  29
  30uint8_t batadv_ring_buffer_avg(const uint8_t lq_recv[])
  31{
  32        const uint8_t *ptr;
  33        uint16_t count = 0, i = 0, sum = 0;
  34
  35        ptr = lq_recv;
  36
  37        while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) {
  38                if (*ptr != 0) {
  39                        count++;
  40                        sum += *ptr;
  41                }
  42
  43                i++;
  44                ptr++;
  45        }
  46
  47        if (count == 0)
  48                return 0;
  49
  50        return (uint8_t)(sum / count);
  51}
  52
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