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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 | ||
d43c36dc | 9 | #include <linux/sched.h> |
12446c67 MN |
10 | #include <linux/spinlock.h> |
11 | #include <linux/poll.h> | |
12 | #include <linux/netdevice.h> | |
13 | #include <linux/types.h> | |
14 | #include <linux/skbuff.h> | |
15 | ||
16 | #include <net/mac80211.h> | |
2c8dccc7 | 17 | #include "rate.h" |
12446c67 MN |
18 | |
19 | #include "rc80211_pid.h" | |
20 | ||
21 | static void rate_control_pid_event(struct rc_pid_event_buffer *buf, | |
22 | enum rc_pid_event_type type, | |
23 | union rc_pid_event_data *data) | |
24 | { | |
25 | struct rc_pid_event *ev; | |
26 | unsigned long status; | |
27 | ||
28 | spin_lock_irqsave(&buf->lock, status); | |
29 | ev = &(buf->ring[buf->next_entry]); | |
30 | buf->next_entry = (buf->next_entry + 1) % RC_PID_EVENT_RING_SIZE; | |
31 | ||
32 | ev->timestamp = jiffies; | |
33 | ev->id = buf->ev_count++; | |
34 | ev->type = type; | |
35 | ev->data = *data; | |
36 | ||
37 | spin_unlock_irqrestore(&buf->lock, status); | |
38 | ||
39 | wake_up_all(&buf->waitqueue); | |
40 | } | |
41 | ||
42 | void rate_control_pid_event_tx_status(struct rc_pid_event_buffer *buf, | |
e039fa4a | 43 | struct ieee80211_tx_info *stat) |
12446c67 MN |
44 | { |
45 | union rc_pid_event_data evd; | |
46 | ||
e6a9854b | 47 | evd.flags = stat->flags; |
e039fa4a | 48 | memcpy(&evd.tx_status, stat, sizeof(struct ieee80211_tx_info)); |
12446c67 MN |
49 | rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_STATUS, &evd); |
50 | } | |
51 | ||
52 | void rate_control_pid_event_rate_change(struct rc_pid_event_buffer *buf, | |
53 | int index, int rate) | |
54 | { | |
55 | union rc_pid_event_data evd; | |
56 | ||
57 | evd.index = index; | |
58 | evd.rate = rate; | |
59 | rate_control_pid_event(buf, RC_PID_EVENT_TYPE_RATE_CHANGE, &evd); | |
60 | } | |
61 | ||
62 | void rate_control_pid_event_tx_rate(struct rc_pid_event_buffer *buf, | |
63 | int index, int rate) | |
64 | { | |
65 | union rc_pid_event_data evd; | |
66 | ||
67 | evd.index = index; | |
68 | evd.rate = rate; | |
69 | rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_RATE, &evd); | |
70 | } | |
71 | ||
72 | void rate_control_pid_event_pf_sample(struct rc_pid_event_buffer *buf, | |
73 | s32 pf_sample, s32 prop_err, | |
74 | s32 int_err, s32 der_err) | |
75 | { | |
76 | union rc_pid_event_data evd; | |
77 | ||
78 | evd.pf_sample = pf_sample; | |
79 | evd.prop_err = prop_err; | |
80 | evd.int_err = int_err; | |
81 | evd.der_err = der_err; | |
82 | rate_control_pid_event(buf, RC_PID_EVENT_TYPE_PF_SAMPLE, &evd); | |
83 | } | |
84 | ||
85 | static int rate_control_pid_events_open(struct inode *inode, struct file *file) | |
86 | { | |
87 | struct rc_pid_sta_info *sinfo = inode->i_private; | |
88 | struct rc_pid_event_buffer *events = &sinfo->events; | |
89 | struct rc_pid_events_file_info *file_info; | |
a1f2aa1b | 90 | unsigned long status; |
12446c67 MN |
91 | |
92 | /* Allocate a state struct */ | |
93 | file_info = kmalloc(sizeof(*file_info), GFP_KERNEL); | |
94 | if (file_info == NULL) | |
95 | return -ENOMEM; | |
96 | ||
97 | spin_lock_irqsave(&events->lock, status); | |
98 | ||
99 | file_info->next_entry = events->next_entry; | |
100 | file_info->events = events; | |
101 | ||
102 | spin_unlock_irqrestore(&events->lock, status); | |
103 | ||
104 | file->private_data = file_info; | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static int rate_control_pid_events_release(struct inode *inode, | |
110 | struct file *file) | |
111 | { | |
112 | struct rc_pid_events_file_info *file_info = file->private_data; | |
113 | ||
114 | kfree(file_info); | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
119 | static unsigned int rate_control_pid_events_poll(struct file *file, | |
120 | poll_table *wait) | |
121 | { | |
122 | struct rc_pid_events_file_info *file_info = file->private_data; | |
123 | ||
124 | poll_wait(file, &file_info->events->waitqueue, wait); | |
125 | ||
126 | return POLLIN | POLLRDNORM; | |
127 | } | |
128 | ||
129 | #define RC_PID_PRINT_BUF_SIZE 64 | |
130 | ||
131 | static ssize_t rate_control_pid_events_read(struct file *file, char __user *buf, | |
132 | size_t length, loff_t *offset) | |
133 | { | |
134 | struct rc_pid_events_file_info *file_info = file->private_data; | |
135 | struct rc_pid_event_buffer *events = file_info->events; | |
136 | struct rc_pid_event *ev; | |
137 | char pb[RC_PID_PRINT_BUF_SIZE]; | |
138 | int ret; | |
139 | int p; | |
a1f2aa1b | 140 | unsigned long status; |
12446c67 MN |
141 | |
142 | /* Check if there is something to read. */ | |
143 | if (events->next_entry == file_info->next_entry) { | |
144 | if (file->f_flags & O_NONBLOCK) | |
145 | return -EAGAIN; | |
146 | ||
147 | /* Wait */ | |
148 | ret = wait_event_interruptible(events->waitqueue, | |
149 | events->next_entry != file_info->next_entry); | |
150 | ||
151 | if (ret) | |
152 | return ret; | |
153 | } | |
154 | ||
155 | /* Write out one event per call. I don't care whether it's a little | |
156 | * inefficient, this is debugging code anyway. */ | |
157 | spin_lock_irqsave(&events->lock, status); | |
158 | ||
159 | /* Get an event */ | |
160 | ev = &(events->ring[file_info->next_entry]); | |
161 | file_info->next_entry = (file_info->next_entry + 1) % | |
162 | RC_PID_EVENT_RING_SIZE; | |
163 | ||
164 | /* Print information about the event. Note that userpace needs to | |
165 | * provide large enough buffers. */ | |
166 | length = length < RC_PID_PRINT_BUF_SIZE ? | |
167 | length : RC_PID_PRINT_BUF_SIZE; | |
168 | p = snprintf(pb, length, "%u %lu ", ev->id, ev->timestamp); | |
169 | switch (ev->type) { | |
170 | case RC_PID_EVENT_TYPE_TX_STATUS: | |
171 | p += snprintf(pb + p, length - p, "tx_status %u %u", | |
e6a9854b JB |
172 | !(ev->data.flags & IEEE80211_TX_STAT_ACK), |
173 | ev->data.tx_status.status.rates[0].idx); | |
12446c67 MN |
174 | break; |
175 | case RC_PID_EVENT_TYPE_RATE_CHANGE: | |
176 | p += snprintf(pb + p, length - p, "rate_change %d %d", | |
177 | ev->data.index, ev->data.rate); | |
178 | break; | |
179 | case RC_PID_EVENT_TYPE_TX_RATE: | |
180 | p += snprintf(pb + p, length - p, "tx_rate %d %d", | |
181 | ev->data.index, ev->data.rate); | |
182 | break; | |
183 | case RC_PID_EVENT_TYPE_PF_SAMPLE: | |
184 | p += snprintf(pb + p, length - p, | |
185 | "pf_sample %d %d %d %d", | |
186 | ev->data.pf_sample, ev->data.prop_err, | |
187 | ev->data.int_err, ev->data.der_err); | |
188 | break; | |
189 | } | |
190 | p += snprintf(pb + p, length - p, "\n"); | |
191 | ||
192 | spin_unlock_irqrestore(&events->lock, status); | |
193 | ||
194 | if (copy_to_user(buf, pb, p)) | |
195 | return -EFAULT; | |
196 | ||
197 | return p; | |
198 | } | |
199 | ||
200 | #undef RC_PID_PRINT_BUF_SIZE | |
201 | ||
5ca1b998 | 202 | static const struct file_operations rc_pid_fop_events = { |
12446c67 MN |
203 | .owner = THIS_MODULE, |
204 | .read = rate_control_pid_events_read, | |
205 | .poll = rate_control_pid_events_poll, | |
206 | .open = rate_control_pid_events_open, | |
207 | .release = rate_control_pid_events_release, | |
208 | }; | |
209 | ||
210 | void rate_control_pid_add_sta_debugfs(void *priv, void *priv_sta, | |
211 | struct dentry *dir) | |
212 | { | |
213 | struct rc_pid_sta_info *spinfo = priv_sta; | |
214 | ||
215 | spinfo->events_entry = debugfs_create_file("rc_pid_events", S_IRUGO, | |
216 | dir, spinfo, | |
217 | &rc_pid_fop_events); | |
218 | } | |
219 | ||
220 | void rate_control_pid_remove_sta_debugfs(void *priv, void *priv_sta) | |
221 | { | |
222 | struct rc_pid_sta_info *spinfo = priv_sta; | |
223 | ||
224 | debugfs_remove(spinfo->events_entry); | |
225 | } |