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 <linux/export.h>
  54 #include <net/mac80211.h>
  55 #include "rc80211_minstrel.h"
  56
  57 int
  58 minstrel_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(2048, GFP_KERNEL);
  66         if (!ms)
  67                 return -ENOMEM;
  68
  69         file->private_data = ms;
  70         p = ms->buf;
  71         p += sprintf(p, "rate          tpt eprob *prob"
  72                         "  *ok(*cum)        ok(      cum)\n");
  73         for (i = 0; i < mi->n_rates; i++) {
  74                 struct minstrel_rate *mr = &mi->r[i];
  75                 struct minstrel_rate_stats *mrs = &mi->r[i].stats;
  76
  77                 *(p++) = (i == mi->max_tp_rate[0]) ? 'A' : ' ';
  78                 *(p++) = (i == mi->max_tp_rate[1]) ? 'B' : ' ';
  79                 *(p++) = (i == mi->max_tp_rate[2]) ? 'C' : ' ';
  80                 *(p++) = (i == mi->max_tp_rate[3]) ? 'D' : ' ';
  81                 *(p++) = (i == mi->max_prob_rate) ? 'P' : ' ';
  82                 p += sprintf(p, "%3u%s", mr->bitrate / 2,
  83                                 (mr->bitrate & 1 ? ".5" : "  "));
  84
  85                 tp = MINSTREL_TRUNC(mrs->cur_tp / 10);
  86                 prob = MINSTREL_TRUNC(mrs->cur_prob * 1000);
  87                 eprob = MINSTREL_TRUNC(mrs->probability * 1000);
  88
  89                 p += sprintf(p, " %4u.%1u %3u.%1u %3u.%1u"
  90                                 " %4u(%4u) %9llu(%9llu)\n",
  91                                 tp / 10, tp % 10,
  92                                 eprob / 10, eprob % 10,
  93                                 prob / 10, prob % 10,
  94                                 mrs->last_success,
  95                                 mrs->last_attempts,
  96                                 (unsigned long long)mrs->succ_hist,
  97                                 (unsigned long long)mrs->att_hist);
  98         }
  99         p += sprintf(p, "\nTotal packet count::    ideal %d      "
 100                         "lookaround %d\n\n",
 101                         mi->total_packets - mi->sample_packets,
 102                         mi->sample_packets);
 103         ms->len = p - ms->buf;
 104
 105         WARN_ON(ms->len + sizeof(*ms) > 2048);
 106
 107         return 0;
 108 }
 109
 110 ssize_t
 111 minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos)
 112 {
 113         struct minstrel_debugfs_info *ms;
 114
 115         ms = file->private_data;
 116         return simple_read_from_buffer(buf, len, ppos, ms->buf, ms->len);
 117 }
 118
 119 int
 120 minstrel_stats_release(struct inode *inode, struct file *file)
 121 {
 122         kfree(file->private_data);
 123         return 0;
 124 }
 125
 126 static const struct file_operations minstrel_stat_fops = {
 127         .owner = THIS_MODULE,
 128         .open = minstrel_stats_open,
 129         .read = minstrel_stats_read,
 130         .release = minstrel_stats_release,
 131         .llseek = default_llseek,
 132 };
 133
 134 void
 135 minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
 136 {
 137         struct minstrel_sta_info *mi = priv_sta;
 138
 139         mi->dbg_stats = debugfs_create_file("rc_stats", S_IRUGO, dir, mi,
 140                         &minstrel_stat_fops);
 141 }
 142
 143 void
 144 minstrel_remove_sta_debugfs(void *priv, void *priv_sta)
 145 {
 146         struct minstrel_sta_info *mi = priv_sta;
 147
 148         debugfs_remove(mi->dbg_stats);
 149 }