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
57int
58minstrel_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[0]) ? 'A' : ' ';
77		*(p++) = (i == mi->max_tp_rate[1]) ? 'B' : ' ';
78		*(p++) = (i == mi->max_tp_rate[2]) ? 'C' : ' ';
79		*(p++) = (i == mi->max_tp_rate[3]) ? 'D' : ' ';
80		*(p++) = (i == mi->max_prob_rate) ? 'P' : ' ';
81		p += sprintf(p, "%3u%s", mr->bitrate / 2,
82				(mr->bitrate & 1 ? ".5" : "  "));
83
84		tp = MINSTREL_TRUNC(mr->cur_tp / 10);
85		prob = MINSTREL_TRUNC(mr->cur_prob * 1000);
86		eprob = MINSTREL_TRUNC(mr->probability * 1000);
87
88		p += sprintf(p, "  %6u.%1u   %6u.%1u   %6u.%1u        "
89				"   %3u(%3u)  %8llu    %8llu\n",
90				tp / 10, tp % 10,
91				eprob / 10, eprob % 10,
92				prob / 10, prob % 10,
93				mr->last_success,
94				mr->last_attempts,
95				(unsigned long long)mr->succ_hist,
96				(unsigned long long)mr->att_hist);
97	}
98	p += sprintf(p, "\nTotal packet count::    ideal %d      "
99			"lookaround %d\n\n",
100			mi->packet_count - mi->sample_count,
101			mi->sample_count);
102	ms->len = p - ms->buf;
103
104	return 0;
105}
106
107ssize_t
108minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos)
109{
110	struct minstrel_debugfs_info *ms;
111
112	ms = file->private_data;
113	return simple_read_from_buffer(buf, len, ppos, ms->buf, ms->len);
114}
115
116int
117minstrel_stats_release(struct inode *inode, struct file *file)
118{
119	kfree(file->private_data);
120	return 0;
121}
122
123static const struct file_operations minstrel_stat_fops = {
124	.owner = THIS_MODULE,
125	.open = minstrel_stats_open,
126	.read = minstrel_stats_read,
127	.release = minstrel_stats_release,
128	.llseek = default_llseek,
129};
130
131void
132minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
133{
134	struct minstrel_sta_info *mi = priv_sta;
135
136	mi->dbg_stats = debugfs_create_file("rc_stats", S_IRUGO, dir, mi,
137			&minstrel_stat_fops);
138}
139
140void
141minstrel_remove_sta_debugfs(void *priv, void *priv_sta)
142{
143	struct minstrel_sta_info *mi = priv_sta;
144
145	debugfs_remove(mi->dbg_stats);
146}
147