8121d3bc683585e22443f7621a90697d73edddbe
[linux-2.6.git] / net / mac80211 / rc80211_pid_debugfs.c
1 /*
2  * Copyright 2007, Mattias Nissler <mattias.nissler@gmx.de>
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
9 #include <linux/spinlock.h>
10 #include <linux/poll.h>
11 #include <linux/netdevice.h>
12 #include <linux/types.h>
13 #include <linux/skbuff.h>
14
15 #include <net/mac80211.h>
16 #include "rate.h"
17
18 #include "rc80211_pid.h"
19
20 static void rate_control_pid_event(struct rc_pid_event_buffer *buf,
21                                    enum rc_pid_event_type type,
22                                    union rc_pid_event_data *data)
23 {
24         struct rc_pid_event *ev;
25         unsigned long status;
26
27         spin_lock_irqsave(&buf->lock, status);
28         ev = &(buf->ring[buf->next_entry]);
29         buf->next_entry = (buf->next_entry + 1) % RC_PID_EVENT_RING_SIZE;
30
31         ev->timestamp = jiffies;
32         ev->id = buf->ev_count++;
33         ev->type = type;
34         ev->data = *data;
35
36         spin_unlock_irqrestore(&buf->lock, status);
37
38         wake_up_all(&buf->waitqueue);
39 }
40
41 void rate_control_pid_event_tx_status(struct rc_pid_event_buffer *buf,
42                                       struct ieee80211_tx_info *stat)
43 {
44         union rc_pid_event_data evd;
45
46         memcpy(&evd.tx_status, stat, sizeof(struct ieee80211_tx_info));
47         rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_STATUS, &evd);
48 }
49
50 void rate_control_pid_event_rate_change(struct rc_pid_event_buffer *buf,
51                                                int index, int rate)
52 {
53         union rc_pid_event_data evd;
54
55         evd.index = index;
56         evd.rate = rate;
57         rate_control_pid_event(buf, RC_PID_EVENT_TYPE_RATE_CHANGE, &evd);
58 }
59
60 void rate_control_pid_event_tx_rate(struct rc_pid_event_buffer *buf,
61                                            int index, int rate)
62 {
63         union rc_pid_event_data evd;
64
65         evd.index = index;
66         evd.rate = rate;
67         rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_RATE, &evd);
68 }
69
70 void rate_control_pid_event_pf_sample(struct rc_pid_event_buffer *buf,
71                                              s32 pf_sample, s32 prop_err,
72                                              s32 int_err, s32 der_err)
73 {
74         union rc_pid_event_data evd;
75
76         evd.pf_sample = pf_sample;
77         evd.prop_err = prop_err;
78         evd.int_err = int_err;
79         evd.der_err = der_err;
80         rate_control_pid_event(buf, RC_PID_EVENT_TYPE_PF_SAMPLE, &evd);
81 }
82
83 static int rate_control_pid_events_open(struct inode *inode, struct file *file)
84 {
85         struct rc_pid_sta_info *sinfo = inode->i_private;
86         struct rc_pid_event_buffer *events = &sinfo->events;
87         struct rc_pid_events_file_info *file_info;
88         unsigned long status;
89
90         /* Allocate a state struct */
91         file_info = kmalloc(sizeof(*file_info), GFP_KERNEL);
92         if (file_info == NULL)
93                 return -ENOMEM;
94
95         spin_lock_irqsave(&events->lock, status);
96
97         file_info->next_entry = events->next_entry;
98         file_info->events = events;
99
100         spin_unlock_irqrestore(&events->lock, status);
101
102         file->private_data = file_info;
103
104         return 0;
105 }
106
107 static int rate_control_pid_events_release(struct inode *inode,
108                                            struct file *file)
109 {
110         struct rc_pid_events_file_info *file_info = file->private_data;
111
112         kfree(file_info);
113
114         return 0;
115 }
116
117 static unsigned int rate_control_pid_events_poll(struct file *file,
118                                                  poll_table *wait)
119 {
120         struct rc_pid_events_file_info *file_info = file->private_data;
121
122         poll_wait(file, &file_info->events->waitqueue, wait);
123
124         return POLLIN | POLLRDNORM;
125 }
126
127 #define RC_PID_PRINT_BUF_SIZE 64
128
129 static ssize_t rate_control_pid_events_read(struct file *file, char __user *buf,
130                                             size_t length, loff_t *offset)
131 {
132         struct rc_pid_events_file_info *file_info = file->private_data;
133         struct rc_pid_event_buffer *events = file_info->events;
134         struct rc_pid_event *ev;
135         char pb[RC_PID_PRINT_BUF_SIZE];
136         int ret;
137         int p;
138         unsigned long status;
139
140         /* Check if there is something to read. */
141         if (events->next_entry == file_info->next_entry) {
142                 if (file->f_flags & O_NONBLOCK)
143                         return -EAGAIN;
144
145                 /* Wait */
146                 ret = wait_event_interruptible(events->waitqueue,
147                                 events->next_entry != file_info->next_entry);
148
149                 if (ret)
150                         return ret;
151         }
152
153         /* Write out one event per call. I don't care whether it's a little
154          * inefficient, this is debugging code anyway. */
155         spin_lock_irqsave(&events->lock, status);
156
157         /* Get an event */
158         ev = &(events->ring[file_info->next_entry]);
159         file_info->next_entry = (file_info->next_entry + 1) %
160                                 RC_PID_EVENT_RING_SIZE;
161
162         /* Print information about the event. Note that userpace needs to
163          * provide large enough buffers. */
164         length = length < RC_PID_PRINT_BUF_SIZE ?
165                  length : RC_PID_PRINT_BUF_SIZE;
166         p = snprintf(pb, length, "%u %lu ", ev->id, ev->timestamp);
167         switch (ev->type) {
168         case RC_PID_EVENT_TYPE_TX_STATUS:
169                 p += snprintf(pb + p, length - p, "tx_status %u %u",
170                               ev->data.tx_status.status.excessive_retries,
171                               ev->data.tx_status.status.retry_count);
172                 break;
173         case RC_PID_EVENT_TYPE_RATE_CHANGE:
174                 p += snprintf(pb + p, length - p, "rate_change %d %d",
175                               ev->data.index, ev->data.rate);
176                 break;
177         case RC_PID_EVENT_TYPE_TX_RATE:
178                 p += snprintf(pb + p, length - p, "tx_rate %d %d",
179                               ev->data.index, ev->data.rate);
180                 break;
181         case RC_PID_EVENT_TYPE_PF_SAMPLE:
182                 p += snprintf(pb + p, length - p,
183                               "pf_sample %d %d %d %d",
184                               ev->data.pf_sample, ev->data.prop_err,
185                               ev->data.int_err, ev->data.der_err);
186                 break;
187         }
188         p += snprintf(pb + p, length - p, "\n");
189
190         spin_unlock_irqrestore(&events->lock, status);
191
192         if (copy_to_user(buf, pb, p))
193                 return -EFAULT;
194
195         return p;
196 }
197
198 #undef RC_PID_PRINT_BUF_SIZE
199
200 static struct file_operations rc_pid_fop_events = {
201         .owner = THIS_MODULE,
202         .read = rate_control_pid_events_read,
203         .poll = rate_control_pid_events_poll,
204         .open = rate_control_pid_events_open,
205         .release = rate_control_pid_events_release,
206 };
207
208 void rate_control_pid_add_sta_debugfs(void *priv, void *priv_sta,
209                                              struct dentry *dir)
210 {
211         struct rc_pid_sta_info *spinfo = priv_sta;
212
213         spinfo->events_entry = debugfs_create_file("rc_pid_events", S_IRUGO,
214                                                    dir, spinfo,
215                                                    &rc_pid_fop_events);
216 }
217
218 void rate_control_pid_remove_sta_debugfs(void *priv, void *priv_sta)
219 {
220         struct rc_pid_sta_info *spinfo = priv_sta;
221
222         debugfs_remove(spinfo->events_entry);
223 }