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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> | |
2c8dccc7 | 16 | #include "rate.h" |
12446c67 MN |
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, | |
e039fa4a | 42 | struct ieee80211_tx_info *stat) |
12446c67 MN |
43 | { |
44 | union rc_pid_event_data evd; | |
45 | ||
e6a9854b | 46 | evd.flags = stat->flags; |
e039fa4a | 47 | memcpy(&evd.tx_status, stat, sizeof(struct ieee80211_tx_info)); |
12446c67 MN |
48 | rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_STATUS, &evd); |
49 | } | |
50 | ||
51 | void rate_control_pid_event_rate_change(struct rc_pid_event_buffer *buf, | |
52 | int index, int rate) | |
53 | { | |
54 | union rc_pid_event_data evd; | |
55 | ||
56 | evd.index = index; | |
57 | evd.rate = rate; | |
58 | rate_control_pid_event(buf, RC_PID_EVENT_TYPE_RATE_CHANGE, &evd); | |
59 | } | |
60 | ||
61 | void rate_control_pid_event_tx_rate(struct rc_pid_event_buffer *buf, | |
62 | int index, int rate) | |
63 | { | |
64 | union rc_pid_event_data evd; | |
65 | ||
66 | evd.index = index; | |
67 | evd.rate = rate; | |
68 | rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_RATE, &evd); | |
69 | } | |
70 | ||
71 | void rate_control_pid_event_pf_sample(struct rc_pid_event_buffer *buf, | |
72 | s32 pf_sample, s32 prop_err, | |
73 | s32 int_err, s32 der_err) | |
74 | { | |
75 | union rc_pid_event_data evd; | |
76 | ||
77 | evd.pf_sample = pf_sample; | |
78 | evd.prop_err = prop_err; | |
79 | evd.int_err = int_err; | |
80 | evd.der_err = der_err; | |
81 | rate_control_pid_event(buf, RC_PID_EVENT_TYPE_PF_SAMPLE, &evd); | |
82 | } | |
83 | ||
84 | static int rate_control_pid_events_open(struct inode *inode, struct file *file) | |
85 | { | |
86 | struct rc_pid_sta_info *sinfo = inode->i_private; | |
87 | struct rc_pid_event_buffer *events = &sinfo->events; | |
88 | struct rc_pid_events_file_info *file_info; | |
a1f2aa1b | 89 | unsigned long status; |
12446c67 MN |
90 | |
91 | /* Allocate a state struct */ | |
92 | file_info = kmalloc(sizeof(*file_info), GFP_KERNEL); | |
93 | if (file_info == NULL) | |
94 | return -ENOMEM; | |
95 | ||
96 | spin_lock_irqsave(&events->lock, status); | |
97 | ||
98 | file_info->next_entry = events->next_entry; | |
99 | file_info->events = events; | |
100 | ||
101 | spin_unlock_irqrestore(&events->lock, status); | |
102 | ||
103 | file->private_data = file_info; | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
108 | static int rate_control_pid_events_release(struct inode *inode, | |
109 | struct file *file) | |
110 | { | |
111 | struct rc_pid_events_file_info *file_info = file->private_data; | |
112 | ||
113 | kfree(file_info); | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | static unsigned int rate_control_pid_events_poll(struct file *file, | |
119 | poll_table *wait) | |
120 | { | |
121 | struct rc_pid_events_file_info *file_info = file->private_data; | |
122 | ||
123 | poll_wait(file, &file_info->events->waitqueue, wait); | |
124 | ||
125 | return POLLIN | POLLRDNORM; | |
126 | } | |
127 | ||
128 | #define RC_PID_PRINT_BUF_SIZE 64 | |
129 | ||
130 | static ssize_t rate_control_pid_events_read(struct file *file, char __user *buf, | |
131 | size_t length, loff_t *offset) | |
132 | { | |
133 | struct rc_pid_events_file_info *file_info = file->private_data; | |
134 | struct rc_pid_event_buffer *events = file_info->events; | |
135 | struct rc_pid_event *ev; | |
136 | char pb[RC_PID_PRINT_BUF_SIZE]; | |
137 | int ret; | |
138 | int p; | |
a1f2aa1b | 139 | unsigned long status; |
12446c67 MN |
140 | |
141 | /* Check if there is something to read. */ | |
142 | if (events->next_entry == file_info->next_entry) { | |
143 | if (file->f_flags & O_NONBLOCK) | |
144 | return -EAGAIN; | |
145 | ||
146 | /* Wait */ | |
147 | ret = wait_event_interruptible(events->waitqueue, | |
148 | events->next_entry != file_info->next_entry); | |
149 | ||
150 | if (ret) | |
151 | return ret; | |
152 | } | |
153 | ||
154 | /* Write out one event per call. I don't care whether it's a little | |
155 | * inefficient, this is debugging code anyway. */ | |
156 | spin_lock_irqsave(&events->lock, status); | |
157 | ||
158 | /* Get an event */ | |
159 | ev = &(events->ring[file_info->next_entry]); | |
160 | file_info->next_entry = (file_info->next_entry + 1) % | |
161 | RC_PID_EVENT_RING_SIZE; | |
162 | ||
163 | /* Print information about the event. Note that userpace needs to | |
164 | * provide large enough buffers. */ | |
165 | length = length < RC_PID_PRINT_BUF_SIZE ? | |
166 | length : RC_PID_PRINT_BUF_SIZE; | |
167 | p = snprintf(pb, length, "%u %lu ", ev->id, ev->timestamp); | |
168 | switch (ev->type) { | |
169 | case RC_PID_EVENT_TYPE_TX_STATUS: | |
170 | p += snprintf(pb + p, length - p, "tx_status %u %u", | |
e6a9854b JB |
171 | !(ev->data.flags & IEEE80211_TX_STAT_ACK), |
172 | ev->data.tx_status.status.rates[0].idx); | |
12446c67 MN |
173 | break; |
174 | case RC_PID_EVENT_TYPE_RATE_CHANGE: | |
175 | p += snprintf(pb + p, length - p, "rate_change %d %d", | |
176 | ev->data.index, ev->data.rate); | |
177 | break; | |
178 | case RC_PID_EVENT_TYPE_TX_RATE: | |
179 | p += snprintf(pb + p, length - p, "tx_rate %d %d", | |
180 | ev->data.index, ev->data.rate); | |
181 | break; | |
182 | case RC_PID_EVENT_TYPE_PF_SAMPLE: | |
183 | p += snprintf(pb + p, length - p, | |
184 | "pf_sample %d %d %d %d", | |
185 | ev->data.pf_sample, ev->data.prop_err, | |
186 | ev->data.int_err, ev->data.der_err); | |
187 | break; | |
188 | } | |
189 | p += snprintf(pb + p, length - p, "\n"); | |
190 | ||
191 | spin_unlock_irqrestore(&events->lock, status); | |
192 | ||
193 | if (copy_to_user(buf, pb, p)) | |
194 | return -EFAULT; | |
195 | ||
196 | return p; | |
197 | } | |
198 | ||
199 | #undef RC_PID_PRINT_BUF_SIZE | |
200 | ||
f704662f | 201 | static struct file_operations rc_pid_fop_events = { |
12446c67 MN |
202 | .owner = THIS_MODULE, |
203 | .read = rate_control_pid_events_read, | |
204 | .poll = rate_control_pid_events_poll, | |
205 | .open = rate_control_pid_events_open, | |
206 | .release = rate_control_pid_events_release, | |
207 | }; | |
208 | ||
209 | void rate_control_pid_add_sta_debugfs(void *priv, void *priv_sta, | |
210 | struct dentry *dir) | |
211 | { | |
212 | struct rc_pid_sta_info *spinfo = priv_sta; | |
213 | ||
214 | spinfo->events_entry = debugfs_create_file("rc_pid_events", S_IRUGO, | |
215 | dir, spinfo, | |
216 | &rc_pid_fop_events); | |
217 | } | |
218 | ||
219 | void rate_control_pid_remove_sta_debugfs(void *priv, void *priv_sta) | |
220 | { | |
221 | struct rc_pid_sta_info *spinfo = priv_sta; | |
222 | ||
223 | debugfs_remove(spinfo->events_entry); | |
224 | } |