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
minstrel_stats_open(struct inode * inode,struct file * file)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(sizeof(*ms) + 4096, GFP_KERNEL);
66 if (!ms)
67 return -ENOMEM;
68
69 file->private_data = ms;
70 p = ms->buf;
71 p += sprintf(p, "rate throughput ewma prob this prob "
72 "this succ/attempt success attempts\n");
73 for (i = 0; i < mi->n_rates; i++) {
74 struct minstrel_rate *mr = &mi->r[i];
75
76 *(p++) = (i == mi->max_tp_rate) ? 'T' : ' ';
77 *(p++) = (i == mi->max_tp_rate2) ? 't' : ' ';
78 *(p++) = (i == mi->max_prob_rate) ? 'P' : ' ';
79 p += sprintf(p, "%3u%s", mr->bitrate / 2,
80 (mr->bitrate & 1 ? ".5" : " "));
81
82 tp = mr->cur_tp / ((18000 << 10) / 96);
83 prob = mr->cur_prob / 18;
84 eprob = mr->probability / 18;
85
86 p += sprintf(p, " %6u.%1u %6u.%1u %6u.%1u "
87 "%3u(%3u) %8llu %8llu\n",
88 tp / 10, tp % 10,
89 eprob / 10, eprob % 10,
90 prob / 10, prob % 10,
91 mr->last_success,
92 mr->last_attempts,
93 (unsigned long long)mr->succ_hist,
94 (unsigned long long)mr->att_hist);
95 }
96 p += sprintf(p, "\nTotal packet count:: ideal %d "
97 "lookaround %d\n\n",
98 mi->packet_count - mi->sample_count,
99 mi->sample_count);
100 ms->len = p - ms->buf;
101
102 return 0;
103 }
104
105 ssize_t
minstrel_stats_read(struct file * file,char __user * buf,size_t len,loff_t * ppos)106 minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos)
107 {
108 struct minstrel_debugfs_info *ms;
109
110 ms = file->private_data;
111 return simple_read_from_buffer(buf, len, ppos, ms->buf, ms->len);
112 }
113
114 int
minstrel_stats_release(struct inode * inode,struct file * file)115 minstrel_stats_release(struct inode *inode, struct file *file)
116 {
117 kfree(file->private_data);
118 return 0;
119 }
120
121 static const struct file_operations minstrel_stat_fops = {
122 .owner = THIS_MODULE,
123 .open = minstrel_stats_open,
124 .read = minstrel_stats_read,
125 .release = minstrel_stats_release,
126 .llseek = default_llseek,
127 };
128
129 void
minstrel_add_sta_debugfs(void * priv,void * priv_sta,struct dentry * dir)130 minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
131 {
132 struct minstrel_sta_info *mi = priv_sta;
133
134 mi->dbg_stats = debugfs_create_file("rc_stats", S_IRUGO, dir, mi,
135 &minstrel_stat_fops);
136 }
137
138 void
minstrel_remove_sta_debugfs(void * priv,void * priv_sta)139 minstrel_remove_sta_debugfs(void *priv, void *priv_sta)
140 {
141 struct minstrel_sta_info *mi = priv_sta;
142
143 debugfs_remove(mi->dbg_stats);
144 }
145