LXR linux/net/mac80211/rc80211_minstrel

   1/*
   2 * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2 as
   6 * published by the Free Software Foundation.
   7 *
   8 * Based on minstrel.c:
   9 *   Copyright (C) 2005-2007 Derek Smithies <derek@indranet.co.nz>
  10 *   Sponsored by Indranet Technologies Ltd
  11 *
  12 * Based on sample.c:
  13 *   Copyright (c) 2005 John Bicket
  14 *   All rights reserved.
  15 *
  16 *   Redistribution and use in source and binary forms, with or without
  17 *   modification, are permitted provided that the following conditions
  18 *   are met:
  19 *   1. Redistributions of source code must retain the above copyright
  20 *      notice, this list of conditions and the following disclaimer,
  21 *      without modification.
  22 *   2. Redistributions in binary form must reproduce at minimum a disclaimer
  23 *      similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
  24 *      redistribution must be conditioned upon including a substantially
  25 *      similar Disclaimer requirement for further binary redistribution.
  26 *   3. Neither the names of the above-listed copyright holders nor the names
  27 *      of any contributors may be used to endorse or promote products derived
  28 *      from this software without specific prior written permission.
  29 *
  30 *   Alternatively, this software may be distributed under the terms of the
  31 *   GNU General Public License ("GPL") version 2 as published by the Free
  32 *   Software Foundation.
  33 *
  34 *   NO WARRANTY
  35 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  36 *   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  37 *   LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
  38 *   AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
  39 *   THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
  40 *   OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  41 *   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  42 *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  43 *   IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  44 *   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  45 *   THE POSSIBILITY OF SUCH DAMAGES.
  46 */
  47#include <linux/netdevice.h>
  48#include <linux/types.h>
  49#include <linux/skbuff.h>
  50#include <linux/debugfs.h>
  51#include <linux/ieee80211.h>
  52#include <linux/slab.h>
  53#include <linux/export.h>
  54#include <net/mac80211.h>
  55#include "rc80211_minstrel.h"
  56
  57int
  58minstrel_stats_open(struct inode *inode, struct file *file)
  59{
  60        struct minstrel_sta_info *mi = inode->i_private;
  61        struct minstrel_debugfs_info *ms;
  62        unsigned int i, tp, prob, eprob;
  63        char *p;
  64
  65        ms = kmalloc(sizeof(*ms) + 4096, GFP_KERNEL);
  66        if (!ms)
  67                return -ENOMEM;
  68
  69        file->private_data = ms;
  70        p = ms->buf;
  71        p += sprintf(p, "rate     throughput  ewma prob   this prob  "
  72                        "this succ/attempt   success    attempts\n");
  73        for (i = 0; i < mi->n_rates; i++) {
  74                struct minstrel_rate *mr = &mi->r[i];
  75
  76                *(p++) = (i == mi->max_tp_rate) ? 'T' : ' ';
  77                *(p++) = (i == mi->max_tp_rate2) ? 't' : ' ';
  78                *(p++) = (i == mi->max_prob_rate) ? 'P' : ' ';
  79                p += sprintf(p, "%3u%s", mr->bitrate / 2,
  80                                (mr->bitrate & 1 ? ".5" : "  "));
  81
  82                tp = mr->cur_tp / ((18000 << 10) / 96);
  83                prob = mr->cur_prob / 18;
  84                eprob = mr->probability / 18;
  85
  86                p += sprintf(p, "  %6u.%1u   %6u.%1u   %6u.%1u        "
  87                                "%3u(%3u)   %8llu    %8llu\n",
  88                                tp / 10, tp % 10,
  89                                eprob / 10, eprob % 10,
  90                                prob / 10, prob % 10,
  91                                mr->last_success,
  92                                mr->last_attempts,
  93                                (unsigned long long)mr->succ_hist,
  94                                (unsigned long long)mr->att_hist);
  95        }
  96        p += sprintf(p, "\nTotal packet count::    ideal %d      "
  97                        "lookaround %d\n\n",
  98                        mi->packet_count - mi->sample_count,
  99                        mi->sample_count);
 100        ms->len = p - ms->buf;
 101
 102        return 0;
 103}
 104
 105ssize_t
 106minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos)
 107{
 108        struct minstrel_debugfs_info *ms;
 109
 110        ms = file->private_data;
 111        return simple_read_from_buffer(buf, len, ppos, ms->buf, ms->len);
 112}
 113
 114int
 115minstrel_stats_release(struct inode *inode, struct file *file)
 116{
 117        kfree(file->private_data);
 118        return 0;
 119}
 120
 121static const struct file_operations minstrel_stat_fops = {
 122        .owner = THIS_MODULE,
 123        .open = minstrel_stats_open,
 124        .read = minstrel_stats_read,
 125        .release = minstrel_stats_release,
 126        .llseek = default_llseek,
 127};
 128
 129void
 130minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
 131{
 132        struct minstrel_sta_info *mi = priv_sta;
 133
 134        mi->dbg_stats = debugfs_create_file("rc_stats", S_IRUGO, dir, mi,
 135                        &minstrel_stat_fops);
 136}
 137
 138void
 139minstrel_remove_sta_debugfs(void *priv, void *priv_sta)
 140{
 141        struct minstrel_sta_info *mi = priv_sta;
 142
 143        debugfs_remove(mi->dbg_stats);
 144}
 145