1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
/*
* Copyright 2007, Mattias Nissler <mattias.nissler@gmx.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/poll.h>
#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <net/mac80211.h>
#include "rate.h"
#include "rc80211_pid.h"
static void rate_control_pid_event(struct rc_pid_event_buffer *buf,
enum rc_pid_event_type type,
union rc_pid_event_data *data)
{
struct rc_pid_event *ev;
unsigned long status;
spin_lock_irqsave(&buf->lock, status);
ev = &(buf->ring[buf->next_entry]);
buf->next_entry = (buf->next_entry + 1) % RC_PID_EVENT_RING_SIZE;
ev->timestamp = jiffies;
ev->id = buf->ev_count++;
ev->type = type;
ev->data = *data;
spin_unlock_irqrestore(&buf->lock, status);
wake_up_all(&buf->waitqueue);
}
void rate_control_pid_event_tx_status(struct rc_pid_event_buffer *buf,
struct ieee80211_tx_info *stat)
{
union rc_pid_event_data evd;
evd.flags = stat->flags;
memcpy(&evd.tx_status, stat, sizeof(struct ieee80211_tx_info));
rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_STATUS, &evd);
}
void rate_control_pid_event_rate_change(struct rc_pid_event_buffer *buf,
int index, int rate)
{
union rc_pid_event_data evd;
evd.index = index;
evd.rate = rate;
rate_control_pid_event(buf, RC_PID_EVENT_TYPE_RATE_CHANGE, &evd);
}
void rate_control_pid_event_tx_rate(struct rc_pid_event_buffer *buf,
int index, int rate)
{
union rc_pid_event_data evd;
evd.index = index;
evd.rate = rate;
rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_RATE, &evd);
}
void rate_control_pid_event_pf_sample(struct rc_pid_event_buffer *buf,
s32 pf_sample, s32 prop_err,
s32 int_err, s32 der_err)
{
union rc_pid_event_data evd;
evd.pf_sample = pf_sample;
evd.prop_err = prop_err;
evd.int_err = int_err;
evd.der_err = der_err;
rate_control_pid_event(buf, RC_PID_EVENT_TYPE_PF_SAMPLE, &evd);
}
static int rate_control_pid_events_open(struct inode *inode, struct file *file)
{
struct rc_pid_sta_info *sinfo = inode->i_private;
struct rc_pid_event_buffer *events = &sinfo->events;
struct rc_pid_events_file_info *file_info;
unsigned long status;
/* Allocate a state struct */
file_info = kmalloc(sizeof(*file_info), GFP_KERNEL);
if (file_info == NULL)
return -ENOMEM;
spin_lock_irqsave(&events->lock, status);
file_info->next_entry = events->next_entry;
file_info->events = events;
spin_unlock_irqrestore(&events->lock, status);
file->private_data = file_info;
return 0;
}
static int rate_control_pid_events_release(struct inode *inode,
struct file *file)
{
struct rc_pid_events_file_info *file_info = file->private_data;
kfree(file_info);
return 0;
}
static unsigned int rate_control_pid_events_poll(struct file *file,
poll_table *wait)
{
struct rc_pid_events_file_info *file_info = file->private_data;
poll_wait(file, &file_info->events->waitqueue, wait);
return POLLIN | POLLRDNORM;
}
#define RC_PID_PRINT_BUF_SIZE 64
static ssize_t rate_control_pid_events_read(struct file *file, char __user *buf,
size_t length, loff_t *offset)
{
struct rc_pid_events_file_info *file_info = file->private_data;
struct rc_pid_event_buffer *events = file_info->events;
struct rc_pid_event *ev;
char pb[RC_PID_PRINT_BUF_SIZE];
int ret;
int p;
unsigned long status;
/* Check if there is something to read. */
if (events->next_entry == file_info->next_entry) {
if (file->f_flags & O_NONBLOCK)
return -EAGAIN;
/* Wait */
ret = wait_event_interruptible(events->waitqueue,
events->next_entry != file_info->next_entry);
if (ret)
return ret;
}
/* Write out one event per call. I don't care whether it's a little
* inefficient, this is debugging code anyway. */
spin_lock_irqsave(&events->lock, status);
/* Get an event */
ev = &(events->ring[file_info->next_entry]);
file_info->next_entry = (file_info->next_entry + 1) %
RC_PID_EVENT_RING_SIZE;
/* Print information about the event. Note that userspace needs to
* provide large enough buffers. */
length = length < RC_PID_PRINT_BUF_SIZE ?
length : RC_PID_PRINT_BUF_SIZE;
p = snprintf(pb, length, "%u %lu ", ev->id, ev->timestamp);
switch (ev->type) {
case RC_PID_EVENT_TYPE_TX_STATUS:
p += snprintf(pb + p, length - p, "tx_status %u %u",
!(ev->data.flags & IEEE80211_TX_STAT_ACK),
ev->data.tx_status.status.rates[0].idx);
break;
case RC_PID_EVENT_TYPE_RATE_CHANGE:
p += snprintf(pb + p, length - p, "rate_change %d %d",
ev->data.index, ev->data.rate);
break;
case RC_PID_EVENT_TYPE_TX_RATE:
p += snprintf(pb + p, length - p, "tx_rate %d %d",
ev->data.index, ev->data.rate);
break;
case RC_PID_EVENT_TYPE_PF_SAMPLE:
p += snprintf(pb + p, length - p,
"pf_sample %d %d %d %d",
ev->data.pf_sample, ev->data.prop_err,
ev->data.int_err, ev->data.der_err);
break;
}
p += snprintf(pb + p, length - p, "\n");
spin_unlock_irqrestore(&events->lock, status);
if (copy_to_user(buf, pb, p))
return -EFAULT;
return p;
}
#undef RC_PID_PRINT_BUF_SIZE
static const struct file_operations rc_pid_fop_events = {
.owner = THIS_MODULE,
.read = rate_control_pid_events_read,
.poll = rate_control_pid_events_poll,
.open = rate_control_pid_events_open,
.release = rate_control_pid_events_release,
.llseek = noop_llseek,
};
void rate_control_pid_add_sta_debugfs(void *priv, void *priv_sta,
struct dentry *dir)
{
struct rc_pid_sta_info *spinfo = priv_sta;
spinfo->events_entry = debugfs_create_file("rc_pid_events", S_IRUGO,
dir, spinfo,
&rc_pid_fop_events);
}
void rate_control_pid_remove_sta_debugfs(void *priv, void *priv_sta)
{
struct rc_pid_sta_info *spinfo = priv_sta;
debugfs_remove(spinfo->events_entry);
}
|
