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
55 struct minstrel_stats_info {
56 struct minstrel_sta_info *mi;
57 char buf[4096];
58 size_t len;
59 };
60
61 static int
minstrel_stats_open(struct inode * inode,struct file * file)62 minstrel_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
109 static ssize_t
minstrel_stats_read(struct file * file,char __user * buf,size_t len,loff_t * o)110 minstrel_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
132 static int
minstrel_stats_release(struct inode * inode,struct file * file)133 minstrel_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
142 static 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
149 void
minstrel_add_sta_debugfs(void * priv,void * priv_sta,struct dentry * dir)150 minstrel_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
158 void
minstrel_remove_sta_debugfs(void * priv,void * priv_sta)159 minstrel_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