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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 | |
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 | mr->succ_hist, | |
98 | 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 int | |
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 | |
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 | |
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 | |
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 | } |