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12446c67 MN |
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 "ieee80211_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_status *stat) | |
43 | { | |
44 | union rc_pid_event_data evd; | |
45 | ||
46 | memcpy(&evd.tx_status, stat, sizeof(struct ieee80211_tx_status)); | |
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 int 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 int 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.excessive_retries, | |
171 | ev->data.tx_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 | ||
f704662f | 200 | static struct file_operations rc_pid_fop_events = { |
12446c67 MN |
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 | } |