net/mac80211/rc80211_minstrel_debugfs.c

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