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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> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
12446c67 MN |
16 | |
17 | #include <net/mac80211.h> | |
2c8dccc7 | 18 | #include "rate.h" |
12446c67 MN |
19 | |
20 | #include "rc80211_pid.h" | |
21 | ||
22 | static void rate_control_pid_event(struct rc_pid_event_buffer *buf, | |
23 | enum rc_pid_event_type type, | |
24 | union rc_pid_event_data *data) | |
25 | { | |
26 | struct rc_pid_event *ev; | |
27 | unsigned long status; | |
28 | ||
29 | spin_lock_irqsave(&buf->lock, status); | |
30 | ev = &(buf->ring[buf->next_entry]); | |
31 | buf->next_entry = (buf->next_entry + 1) % RC_PID_EVENT_RING_SIZE; | |
32 | ||
33 | ev->timestamp = jiffies; | |
34 | ev->id = buf->ev_count++; | |
35 | ev->type = type; | |
36 | ev->data = *data; | |
37 | ||
38 | spin_unlock_irqrestore(&buf->lock, status); | |
39 | ||
40 | wake_up_all(&buf->waitqueue); | |
41 | } | |
42 | ||
43 | void rate_control_pid_event_tx_status(struct rc_pid_event_buffer *buf, | |
e039fa4a | 44 | struct ieee80211_tx_info *stat) |
12446c67 MN |
45 | { |
46 | union rc_pid_event_data evd; | |
47 | ||
e6a9854b | 48 | evd.flags = stat->flags; |
e039fa4a | 49 | memcpy(&evd.tx_status, stat, sizeof(struct ieee80211_tx_info)); |
12446c67 MN |
50 | rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_STATUS, &evd); |
51 | } | |
52 | ||
53 | void rate_control_pid_event_rate_change(struct rc_pid_event_buffer *buf, | |
54 | int index, int rate) | |
55 | { | |
56 | union rc_pid_event_data evd; | |
57 | ||
58 | evd.index = index; | |
59 | evd.rate = rate; | |
60 | rate_control_pid_event(buf, RC_PID_EVENT_TYPE_RATE_CHANGE, &evd); | |
61 | } | |
62 | ||
63 | void rate_control_pid_event_tx_rate(struct rc_pid_event_buffer *buf, | |
64 | int index, int rate) | |
65 | { | |
66 | union rc_pid_event_data evd; | |
67 | ||
68 | evd.index = index; | |
69 | evd.rate = rate; | |
70 | rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_RATE, &evd); | |
71 | } | |
72 | ||
73 | void rate_control_pid_event_pf_sample(struct rc_pid_event_buffer *buf, | |
74 | s32 pf_sample, s32 prop_err, | |
75 | s32 int_err, s32 der_err) | |
76 | { | |
77 | union rc_pid_event_data evd; | |
78 | ||
79 | evd.pf_sample = pf_sample; | |
80 | evd.prop_err = prop_err; | |
81 | evd.int_err = int_err; | |
82 | evd.der_err = der_err; | |
83 | rate_control_pid_event(buf, RC_PID_EVENT_TYPE_PF_SAMPLE, &evd); | |
84 | } | |
85 | ||
86 | static int rate_control_pid_events_open(struct inode *inode, struct file *file) | |
87 | { | |
88 | struct rc_pid_sta_info *sinfo = inode->i_private; | |
89 | struct rc_pid_event_buffer *events = &sinfo->events; | |
90 | struct rc_pid_events_file_info *file_info; | |
a1f2aa1b | 91 | unsigned long status; |
12446c67 MN |
92 | |
93 | /* Allocate a state struct */ | |
94 | file_info = kmalloc(sizeof(*file_info), GFP_KERNEL); | |
95 | if (file_info == NULL) | |
96 | return -ENOMEM; | |
97 | ||
98 | spin_lock_irqsave(&events->lock, status); | |
99 | ||
100 | file_info->next_entry = events->next_entry; | |
101 | file_info->events = events; | |
102 | ||
103 | spin_unlock_irqrestore(&events->lock, status); | |
104 | ||
105 | file->private_data = file_info; | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | static int rate_control_pid_events_release(struct inode *inode, | |
111 | struct file *file) | |
112 | { | |
113 | struct rc_pid_events_file_info *file_info = file->private_data; | |
114 | ||
115 | kfree(file_info); | |
116 | ||
117 | return 0; | |
118 | } | |
119 | ||
120 | static unsigned int rate_control_pid_events_poll(struct file *file, | |
121 | poll_table *wait) | |
122 | { | |
123 | struct rc_pid_events_file_info *file_info = file->private_data; | |
124 | ||
125 | poll_wait(file, &file_info->events->waitqueue, wait); | |
126 | ||
127 | return POLLIN | POLLRDNORM; | |
128 | } | |
129 | ||
130 | #define RC_PID_PRINT_BUF_SIZE 64 | |
131 | ||
132 | static ssize_t rate_control_pid_events_read(struct file *file, char __user *buf, | |
133 | size_t length, loff_t *offset) | |
134 | { | |
135 | struct rc_pid_events_file_info *file_info = file->private_data; | |
136 | struct rc_pid_event_buffer *events = file_info->events; | |
137 | struct rc_pid_event *ev; | |
138 | char pb[RC_PID_PRINT_BUF_SIZE]; | |
139 | int ret; | |
140 | int p; | |
a1f2aa1b | 141 | unsigned long status; |
12446c67 MN |
142 | |
143 | /* Check if there is something to read. */ | |
144 | if (events->next_entry == file_info->next_entry) { | |
145 | if (file->f_flags & O_NONBLOCK) | |
146 | return -EAGAIN; | |
147 | ||
148 | /* Wait */ | |
149 | ret = wait_event_interruptible(events->waitqueue, | |
150 | events->next_entry != file_info->next_entry); | |
151 | ||
152 | if (ret) | |
153 | return ret; | |
154 | } | |
155 | ||
156 | /* Write out one event per call. I don't care whether it's a little | |
157 | * inefficient, this is debugging code anyway. */ | |
158 | spin_lock_irqsave(&events->lock, status); | |
159 | ||
160 | /* Get an event */ | |
161 | ev = &(events->ring[file_info->next_entry]); | |
162 | file_info->next_entry = (file_info->next_entry + 1) % | |
163 | RC_PID_EVENT_RING_SIZE; | |
164 | ||
165 | /* Print information about the event. Note that userpace needs to | |
166 | * provide large enough buffers. */ | |
167 | length = length < RC_PID_PRINT_BUF_SIZE ? | |
168 | length : RC_PID_PRINT_BUF_SIZE; | |
169 | p = snprintf(pb, length, "%u %lu ", ev->id, ev->timestamp); | |
170 | switch (ev->type) { | |
171 | case RC_PID_EVENT_TYPE_TX_STATUS: | |
172 | p += snprintf(pb + p, length - p, "tx_status %u %u", | |
e6a9854b JB |
173 | !(ev->data.flags & IEEE80211_TX_STAT_ACK), |
174 | ev->data.tx_status.status.rates[0].idx); | |
12446c67 MN |
175 | break; |
176 | case RC_PID_EVENT_TYPE_RATE_CHANGE: | |
177 | p += snprintf(pb + p, length - p, "rate_change %d %d", | |
178 | ev->data.index, ev->data.rate); | |
179 | break; | |
180 | case RC_PID_EVENT_TYPE_TX_RATE: | |
181 | p += snprintf(pb + p, length - p, "tx_rate %d %d", | |
182 | ev->data.index, ev->data.rate); | |
183 | break; | |
184 | case RC_PID_EVENT_TYPE_PF_SAMPLE: | |
185 | p += snprintf(pb + p, length - p, | |
186 | "pf_sample %d %d %d %d", | |
187 | ev->data.pf_sample, ev->data.prop_err, | |
188 | ev->data.int_err, ev->data.der_err); | |
189 | break; | |
190 | } | |
191 | p += snprintf(pb + p, length - p, "\n"); | |
192 | ||
193 | spin_unlock_irqrestore(&events->lock, status); | |
194 | ||
195 | if (copy_to_user(buf, pb, p)) | |
196 | return -EFAULT; | |
197 | ||
198 | return p; | |
199 | } | |
200 | ||
201 | #undef RC_PID_PRINT_BUF_SIZE | |
202 | ||
5ca1b998 | 203 | static const struct file_operations rc_pid_fop_events = { |
12446c67 MN |
204 | .owner = THIS_MODULE, |
205 | .read = rate_control_pid_events_read, | |
206 | .poll = rate_control_pid_events_poll, | |
207 | .open = rate_control_pid_events_open, | |
208 | .release = rate_control_pid_events_release, | |
209 | }; | |
210 | ||
211 | void rate_control_pid_add_sta_debugfs(void *priv, void *priv_sta, | |
212 | struct dentry *dir) | |
213 | { | |
214 | struct rc_pid_sta_info *spinfo = priv_sta; | |
215 | ||
216 | spinfo->events_entry = debugfs_create_file("rc_pid_events", S_IRUGO, | |
217 | dir, spinfo, | |
218 | &rc_pid_fop_events); | |
219 | } | |
220 | ||
221 | void rate_control_pid_remove_sta_debugfs(void *priv, void *priv_sta) | |
222 | { | |
223 | struct rc_pid_sta_info *spinfo = priv_sta; | |
224 | ||
225 | debugfs_remove(spinfo->events_entry); | |
226 | } |