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Linux/net/mac80211/rc80211_pid_debugfs.c

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  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/sched.h>
 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 #include <linux/slab.h>
 16 
 17 #include <net/mac80211.h>
 18 #include "rate.h"
 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,
 44                                       struct ieee80211_tx_info *stat)
 45 {
 46         union rc_pid_event_data evd;
 47 
 48         evd.flags = stat->flags;
 49         memcpy(&evd.tx_status, stat, sizeof(struct ieee80211_tx_info));
 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;
 91         unsigned long status;
 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;
141         unsigned long status;
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 userspace 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",
173                               !(ev->data.flags & IEEE80211_TX_STAT_ACK),
174                               ev->data.tx_status.status.rates[0].idx);
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 
203 static const struct file_operations rc_pid_fop_events = {
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         .llseek = noop_llseek,
210 };
211 
212 void rate_control_pid_add_sta_debugfs(void *priv, void *priv_sta,
213                                              struct dentry *dir)
214 {
215         struct rc_pid_sta_info *spinfo = priv_sta;
216 
217         spinfo->events_entry = debugfs_create_file("rc_pid_events", S_IRUGO,
218                                                    dir, spinfo,
219                                                    &rc_pid_fop_events);
220 }
221 
222 void rate_control_pid_remove_sta_debugfs(void *priv, void *priv_sta)
223 {
224         struct rc_pid_sta_info *spinfo = priv_sta;
225 
226         debugfs_remove(spinfo->events_entry);
227 }
228 

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