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Felix Fietkaucccf1292008-10-05 18:07:45 +02001/*
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
Felix Fietkaucccf1292008-10-05 18:07:45 +020055static int
56minstrel_stats_open(struct inode *inode, struct file *file)
57{
58 struct minstrel_sta_info *mi = inode->i_private;
Felix Fietkau44ac91e2010-03-01 22:17:38 +010059 struct minstrel_debugfs_info *ms;
Felix Fietkaucccf1292008-10-05 18:07:45 +020060 unsigned int i, tp, prob, eprob;
61 char *p;
62
Felix Fietkau44ac91e2010-03-01 22:17:38 +010063 ms = kmalloc(sizeof(*ms) + 4096, GFP_KERNEL);
Felix Fietkaucccf1292008-10-05 18:07:45 +020064 if (!ms)
65 return -ENOMEM;
66
67 file->private_data = ms;
68 p = ms->buf;
69 p += sprintf(p, "rate throughput ewma prob this prob "
70 "this succ/attempt success attempts\n");
71 for (i = 0; i < mi->n_rates; i++) {
72 struct minstrel_rate *mr = &mi->r[i];
73
74 *(p++) = (i == mi->max_tp_rate) ? 'T' : ' ';
75 *(p++) = (i == mi->max_tp_rate2) ? 't' : ' ';
76 *(p++) = (i == mi->max_prob_rate) ? 'P' : ' ';
77 p += sprintf(p, "%3u%s", mr->bitrate / 2,
78 (mr->bitrate & 1 ? ".5" : " "));
79
Arnd Hannemanneadac6b2009-08-24 20:51:46 +020080 tp = mr->cur_tp / ((18000 << 10) / 96);
Felix Fietkaucccf1292008-10-05 18:07:45 +020081 prob = mr->cur_prob / 18;
82 eprob = mr->probability / 18;
83
84 p += sprintf(p, " %6u.%1u %6u.%1u %6u.%1u "
85 "%3u(%3u) %8llu %8llu\n",
86 tp / 10, tp % 10,
87 eprob / 10, eprob % 10,
88 prob / 10, prob % 10,
89 mr->last_success,
90 mr->last_attempts,
John W. Linville51b94bf2008-10-22 19:41:34 -040091 (unsigned long long)mr->succ_hist,
92 (unsigned long long)mr->att_hist);
Felix Fietkaucccf1292008-10-05 18:07:45 +020093 }
94 p += sprintf(p, "\nTotal packet count:: ideal %d "
95 "lookaround %d\n\n",
96 mi->packet_count - mi->sample_count,
97 mi->sample_count);
98 ms->len = p - ms->buf;
99
100 return 0;
101}
102
John W. Linville51b94bf2008-10-22 19:41:34 -0400103static ssize_t
Felix Fietkau44ac91e2010-03-01 22:17:38 +0100104minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos)
Felix Fietkaucccf1292008-10-05 18:07:45 +0200105{
Felix Fietkau44ac91e2010-03-01 22:17:38 +0100106 struct minstrel_debugfs_info *ms;
Felix Fietkaucccf1292008-10-05 18:07:45 +0200107
108 ms = file->private_data;
Felix Fietkau44ac91e2010-03-01 22:17:38 +0100109 return simple_read_from_buffer(buf, len, ppos, ms->buf, ms->len);
Felix Fietkaucccf1292008-10-05 18:07:45 +0200110}
111
112static int
113minstrel_stats_release(struct inode *inode, struct file *file)
114{
Felix Fietkau44ac91e2010-03-01 22:17:38 +0100115 kfree(file->private_data);
Felix Fietkaucccf1292008-10-05 18:07:45 +0200116 return 0;
117}
118
Stephen Hemminger5ca1b992009-09-01 19:25:05 +0000119static const struct file_operations minstrel_stat_fops = {
Felix Fietkaucccf1292008-10-05 18:07:45 +0200120 .owner = THIS_MODULE,
121 .open = minstrel_stats_open,
122 .read = minstrel_stats_read,
123 .release = minstrel_stats_release,
124};
125
126void
127minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
128{
129 struct minstrel_sta_info *mi = priv_sta;
130
131 mi->dbg_stats = debugfs_create_file("rc_stats", S_IRUGO, dir, mi,
132 &minstrel_stat_fops);
133}
134
135void
136minstrel_remove_sta_debugfs(void *priv, void *priv_sta)
137{
138 struct minstrel_sta_info *mi = priv_sta;
139
140 debugfs_remove(mi->dbg_stats);
141}