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 ssize_t
  58 minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos)
  59 {
  60         struct minstrel_debugfs_info *ms;
  61
  62         ms = file->private_data;
  63         return simple_read_from_buffer(buf, len, ppos, ms->buf, ms->len);
  64 }
  65
  66 int
  67 minstrel_stats_release(struct inode *inode, struct file *file)
  68 {
  69         kfree(file->private_data);
  70         return 0;
  71 }
  72
  73 int
  74 minstrel_stats_open(struct inode *inode, struct file *file)
  75 {
  76         struct minstrel_sta_info *mi = inode->i_private;
  77         struct minstrel_debugfs_info *ms;
  78         unsigned int i, tp_max, tp_avg, eprob;
  79         char *p;
  80
  81         ms = kmalloc(2048, GFP_KERNEL);
  82         if (!ms)
  83                 return -ENOMEM;
  84
  85         file->private_data = ms;
  86         p = ms->buf;
  87         p += sprintf(p, "\n");
  88         p += sprintf(p,
  89                      "best   __________rate_________    ________statistics________    ____last_____    ______sum-of________\n");
  90         p += sprintf(p,
  91                      "rate  [name idx airtime max_tp]  [avg(tp) avg(prob) sd(prob)]  [retry|suc|att]  [#success | #attempts]\n");
  92
  93         for (i = 0; i < mi->n_rates; i++) {
  94                 struct minstrel_rate *mr = &mi->r[i];
  95                 struct minstrel_rate_stats *mrs = &mi->r[i].stats;
  96                 unsigned int prob_ewmsd;
  97
  98                 *(p++) = (i == mi->max_tp_rate[0]) ? 'A' : ' ';
  99                 *(p++) = (i == mi->max_tp_rate[1]) ? 'B' : ' ';
 100                 *(p++) = (i == mi->max_tp_rate[2]) ? 'C' : ' ';
 101                 *(p++) = (i == mi->max_tp_rate[3]) ? 'D' : ' ';
 102                 *(p++) = (i == mi->max_prob_rate) ? 'P' : ' ';
 103
 104                 p += sprintf(p, " %3u%s ", mr->bitrate / 2,
 105                                 (mr->bitrate & 1 ? ".5" : "  "));
 106                 p += sprintf(p, "%3u  ", i);
 107                 p += sprintf(p, "%6u ", mr->perfect_tx_time);
 108
 109                 tp_max = minstrel_get_tp_avg(mr, MINSTREL_FRAC(100,100));
 110                 tp_avg = minstrel_get_tp_avg(mr, mrs->prob_ewma);
 111                 eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);
 112                 prob_ewmsd = minstrel_get_ewmsd10(mrs);
 113
 114                 p += sprintf(p, "%4u.%1u    %4u.%1u     %3u.%1u    %3u.%1u"
 115                                 "     %3u   %3u %-3u   "
 116                                 "%9llu   %-9llu\n",
 117                                 tp_max / 10, tp_max % 10,
 118                                 tp_avg / 10, tp_avg % 10,
 119                                 eprob / 10, eprob % 10,
 120                                 prob_ewmsd / 10, prob_ewmsd % 10,
 121                                 mrs->retry_count,
 122                                 mrs->last_success,
 123                                 mrs->last_attempts,
 124                                 (unsigned long long)mrs->succ_hist,
 125                                 (unsigned long long)mrs->att_hist);
 126         }
 127         p += sprintf(p, "\nTotal packet count::    ideal %d      "
 128                         "lookaround %d\n\n",
 129                         mi->total_packets - mi->sample_packets,
 130                         mi->sample_packets);
 131         ms->len = p - ms->buf;
 132
 133         WARN_ON(ms->len + sizeof(*ms) > 2048);
 134
 135         return 0;
 136 }
 137
 138 static const struct file_operations minstrel_stat_fops = {
 139         .owner = THIS_MODULE,
 140         .open = minstrel_stats_open,
 141         .read = minstrel_stats_read,
 142         .release = minstrel_stats_release,
 143         .llseek = default_llseek,
 144 };
 145
 146 int
 147 minstrel_stats_csv_open(struct inode *inode, struct file *file)
 148 {
 149         struct minstrel_sta_info *mi = inode->i_private;
 150         struct minstrel_debugfs_info *ms;
 151         unsigned int i, tp_max, tp_avg, eprob;
 152         char *p;
 153
 154         ms = kmalloc(2048, GFP_KERNEL);
 155         if (!ms)
 156                 return -ENOMEM;
 157
 158         file->private_data = ms;
 159         p = ms->buf;
 160
 161         for (i = 0; i < mi->n_rates; i++) {
 162                 struct minstrel_rate *mr = &mi->r[i];
 163                 struct minstrel_rate_stats *mrs = &mi->r[i].stats;
 164                 unsigned int prob_ewmsd;
 165
 166                 p += sprintf(p, "%s" ,((i == mi->max_tp_rate[0]) ? "A" : ""));
 167                 p += sprintf(p, "%s" ,((i == mi->max_tp_rate[1]) ? "B" : ""));
 168                 p += sprintf(p, "%s" ,((i == mi->max_tp_rate[2]) ? "C" : ""));
 169                 p += sprintf(p, "%s" ,((i == mi->max_tp_rate[3]) ? "D" : ""));
 170                 p += sprintf(p, "%s" ,((i == mi->max_prob_rate) ? "P" : ""));
 171
 172                 p += sprintf(p, ",%u%s", mr->bitrate / 2,
 173                                 (mr->bitrate & 1 ? ".5," : ","));
 174                 p += sprintf(p, "%u,", i);
 175                 p += sprintf(p, "%u,",mr->perfect_tx_time);
 176
 177                 tp_max = minstrel_get_tp_avg(mr, MINSTREL_FRAC(100,100));
 178                 tp_avg = minstrel_get_tp_avg(mr, mrs->prob_ewma);
 179                 eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);
 180                 prob_ewmsd = minstrel_get_ewmsd10(mrs);
 181
 182                 p += sprintf(p, "%u.%u,%u.%u,%u.%u,%u.%u,%u,%u,%u,"
 183                                 "%llu,%llu,%d,%d\n",
 184                                 tp_max / 10, tp_max % 10,
 185                                 tp_avg / 10, tp_avg % 10,
 186                                 eprob / 10, eprob % 10,
 187                                 prob_ewmsd / 10, prob_ewmsd % 10,
 188                                 mrs->retry_count,
 189                                 mrs->last_success,
 190                                 mrs->last_attempts,
 191                                 (unsigned long long)mrs->succ_hist,
 192                                 (unsigned long long)mrs->att_hist,
 193                                 mi->total_packets - mi->sample_packets,
 194                                 mi->sample_packets);
 195
 196         }
 197         ms->len = p - ms->buf;
 198
 199         WARN_ON(ms->len + sizeof(*ms) > 2048);
 200
 201         return 0;
 202 }
 203
 204 static const struct file_operations minstrel_stat_csv_fops = {
 205         .owner = THIS_MODULE,
 206         .open = minstrel_stats_csv_open,
 207         .read = minstrel_stats_read,
 208         .release = minstrel_stats_release,
 209         .llseek = default_llseek,
 210 };
 211
 212 void
 213 minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
 214 {
 215         struct minstrel_sta_info *mi = priv_sta;
 216
 217         mi->dbg_stats = debugfs_create_file("rc_stats", 0444, dir, mi,
 218                                             &minstrel_stat_fops);
 219
 220         mi->dbg_stats_csv = debugfs_create_file("rc_stats_csv", 0444, dir, mi,
 221                                                 &minstrel_stat_csv_fops);
 222 }
 223
 224 void
 225 minstrel_remove_sta_debugfs(void *priv, void *priv_sta)
 226 {
 227         struct minstrel_sta_info *mi = priv_sta;
 228
 229         debugfs_remove(mi->dbg_stats);
 230
 231         debugfs_remove(mi->dbg_stats_csv);
 232 }