linux/net/mac80211/rc80211_minstrel_debugfs.c
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   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 <net/mac80211.h>
  53#include "rc80211_minstrel.h"
  54
  55struct minstrel_stats_info {
  56        struct minstrel_sta_info *mi;
  57        char buf[4096];
  58        size_t len;
  59};
  60
  61static int
  62minstrel_stats_open(struct inode *inode, struct file *file)
  63{
  64        struct minstrel_sta_info *mi = inode->i_private;
  65        struct minstrel_stats_info *ms;
  66        unsigned int i, tp, prob, eprob;
  67        char *p;
  68
  69        ms = kmalloc(sizeof(*ms), GFP_KERNEL);
  70        if (!ms)
  71                return -ENOMEM;
  72
  73        file->private_data = ms;
  74        p = ms->buf;
  75        p += sprintf(p, "rate     throughput  ewma prob   this prob  "
  76                        "this succ/attempt   success    attempts\n");
  77        for (i = 0; i < mi->n_rates; i++) {
  78                struct minstrel_rate *mr = &mi->r[i];
  79
  80                *(p++) = (i == mi->max_tp_rate) ? 'T' : ' ';
  81                *(p++) = (i == mi->max_tp_rate2) ? 't' : ' ';
  82                *(p++) = (i == mi->max_prob_rate) ? 'P' : ' ';
  83                p += sprintf(p, "%3u%s", mr->bitrate / 2,
  84                                (mr->bitrate & 1 ? ".5" : "  "));
  85
  86                tp = ((mr->cur_tp * 96) / 18000) >> 10;
  87                prob = mr->cur_prob / 18;
  88                eprob = mr->probability / 18;
  89
  90                p += sprintf(p, "  %6u.%1u   %6u.%1u   %6u.%1u        "
  91                                "%3u(%3u)   %8llu    %8llu\n",
  92                                tp / 10, tp % 10,
  93                                eprob / 10, eprob % 10,
  94                                prob / 10, prob % 10,
  95                                mr->last_success,
  96                                mr->last_attempts,
  97                                (unsigned long long)mr->succ_hist,
  98                                (unsigned long long)mr->att_hist);
  99        }
 100        p += sprintf(p, "\nTotal packet count::    ideal %d      "
 101                        "lookaround %d\n\n",
 102                        mi->packet_count - mi->sample_count,
 103                        mi->sample_count);
 104        ms->len = p - ms->buf;
 105
 106        return 0;
 107}
 108
 109static ssize_t
 110minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *o)
 111{
 112        struct minstrel_stats_info *ms;
 113        char *src;
 114
 115        ms = file->private_data;
 116        src = ms->buf;
 117
 118        len = min(len, ms->len);
 119        if (len <= *o)
 120                return 0;
 121
 122        src += *o;
 123        len -= *o;
 124        *o += len;
 125
 126        if (copy_to_user(buf, src, len))
 127                return -EFAULT;
 128
 129        return len;
 130}
 131
 132static int
 133minstrel_stats_release(struct inode *inode, struct file *file)
 134{
 135        struct minstrel_stats_info *ms = file->private_data;
 136
 137        kfree(ms);
 138
 139        return 0;
 140}
 141
 142static struct file_operations minstrel_stat_fops = {
 143        .owner = THIS_MODULE,
 144        .open = minstrel_stats_open,
 145        .read = minstrel_stats_read,
 146        .release = minstrel_stats_release,
 147};
 148
 149void
 150minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
 151{
 152        struct minstrel_sta_info *mi = priv_sta;
 153
 154        mi->dbg_stats = debugfs_create_file("rc_stats", S_IRUGO, dir, mi,
 155                        &minstrel_stat_fops);
 156}
 157
 158void
 159minstrel_remove_sta_debugfs(void *priv, void *priv_sta)
 160{
 161        struct minstrel_sta_info *mi = priv_sta;
 162
 163        debugfs_remove(mi->dbg_stats);
 164}
 165