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