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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 #include <linux/export.h>
 17 
 18 #include <net/mac80211.h>
 19 #include "rate.h"
 20 
 21 #include "rc80211_pid.h"
 22 
 23 static void rate_control_pid_event(struct rc_pid_event_buffer *buf,
 24                                    enum rc_pid_event_type type,
 25                                    union rc_pid_event_data *data)
 26 {
 27         struct rc_pid_event *ev;
 28         unsigned long status;
 29 
 30         spin_lock_irqsave(&buf->lock, status);
 31         ev = &(buf->ring[buf->next_entry]);
 32         buf->next_entry = (buf->next_entry + 1) % RC_PID_EVENT_RING_SIZE;
 33 
 34         ev->timestamp = jiffies;
 35         ev->id = buf->ev_count++;
 36         ev->type = type;
 37         ev->data = *data;
 38 
 39         spin_unlock_irqrestore(&buf->lock, status);
 40 
 41         wake_up_all(&buf->waitqueue);
 42 }
 43 
 44 void rate_control_pid_event_tx_status(struct rc_pid_event_buffer *buf,
 45                                       struct ieee80211_tx_info *stat)
 46 {
 47         union rc_pid_event_data evd;
 48 
 49         evd.flags = stat->flags;
 50         memcpy(&evd.tx_status, stat, sizeof(struct ieee80211_tx_info));
 51         rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_STATUS, &evd);
 52 }
 53 
 54 void rate_control_pid_event_rate_change(struct rc_pid_event_buffer *buf,
 55                                                int index, int rate)
 56 {
 57         union rc_pid_event_data evd;
 58 
 59         evd.index = index;
 60         evd.rate = rate;
 61         rate_control_pid_event(buf, RC_PID_EVENT_TYPE_RATE_CHANGE, &evd);
 62 }
 63 
 64 void rate_control_pid_event_tx_rate(struct rc_pid_event_buffer *buf,
 65                                            int index, int rate)
 66 {
 67         union rc_pid_event_data evd;
 68 
 69         evd.index = index;
 70         evd.rate = rate;
 71         rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_RATE, &evd);
 72 }
 73 
 74 void rate_control_pid_event_pf_sample(struct rc_pid_event_buffer *buf,
 75                                              s32 pf_sample, s32 prop_err,
 76                                              s32 int_err, s32 der_err)
 77 {
 78         union rc_pid_event_data evd;
 79 
 80         evd.pf_sample = pf_sample;
 81         evd.prop_err = prop_err;
 82         evd.int_err = int_err;
 83         evd.der_err = der_err;
 84         rate_control_pid_event(buf, RC_PID_EVENT_TYPE_PF_SAMPLE, &evd);
 85 }
 86 
 87 static int rate_control_pid_events_open(struct inode *inode, struct file *file)
 88 {
 89         struct rc_pid_sta_info *sinfo = inode->i_private;
 90         struct rc_pid_event_buffer *events = &sinfo->events;
 91         struct rc_pid_events_file_info *file_info;
 92         unsigned long status;
 93 
 94         /* Allocate a state struct */
 95         file_info = kmalloc(sizeof(*file_info), GFP_KERNEL);
 96         if (file_info == NULL)
 97                 return -ENOMEM;
 98 
 99         spin_lock_irqsave(&events->lock, status);
100 
101         file_info->next_entry = events->next_entry;
102         file_info->events = events;
103 
104         spin_unlock_irqrestore(&events->lock, status);
105 
106         file->private_data = file_info;
107 
108         return 0;
109 }
110 
111 static int rate_control_pid_events_release(struct inode *inode,
112                                            struct file *file)
113 {
114         struct rc_pid_events_file_info *file_info = file->private_data;
115 
116         kfree(file_info);
117 
118         return 0;
119 }
120 
121 static unsigned int rate_control_pid_events_poll(struct file *file,
122                                                  poll_table *wait)
123 {
124         struct rc_pid_events_file_info *file_info = file->private_data;
125 
126         poll_wait(file, &file_info->events->waitqueue, wait);
127 
128         return POLLIN | POLLRDNORM;
129 }
130 
131 #define RC_PID_PRINT_BUF_SIZE 64
132 
133 static ssize_t rate_control_pid_events_read(struct file *file, char __user *buf,
134                                             size_t length, loff_t *offset)
135 {
136         struct rc_pid_events_file_info *file_info = file->private_data;
137         struct rc_pid_event_buffer *events = file_info->events;
138         struct rc_pid_event *ev;
139         char pb[RC_PID_PRINT_BUF_SIZE];
140         int ret;
141         int p;
142         unsigned long status;
143 
144         /* Check if there is something to read. */
145         if (events->next_entry == file_info->next_entry) {
146                 if (file->f_flags & O_NONBLOCK)
147                         return -EAGAIN;
148 
149                 /* Wait */
150                 ret = wait_event_interruptible(events->waitqueue,
151                                 events->next_entry != file_info->next_entry);
152 
153                 if (ret)
154                         return ret;
155         }
156 
157         /* Write out one event per call. I don't care whether it's a little
158          * inefficient, this is debugging code anyway. */
159         spin_lock_irqsave(&events->lock, status);
160 
161         /* Get an event */
162         ev = &(events->ring[file_info->next_entry]);
163         file_info->next_entry = (file_info->next_entry + 1) %
164                                 RC_PID_EVENT_RING_SIZE;
165 
166         /* Print information about the event. Note that userspace needs to
167          * provide large enough buffers. */
168         length = length < RC_PID_PRINT_BUF_SIZE ?
169                  length : RC_PID_PRINT_BUF_SIZE;
170         p = snprintf(pb, length, "%u %lu ", ev->id, ev->timestamp);
171         switch (ev->type) {
172         case RC_PID_EVENT_TYPE_TX_STATUS:
173                 p += snprintf(pb + p, length - p, "tx_status %u %u",
174                               !(ev->data.flags & IEEE80211_TX_STAT_ACK),
175                               ev->data.tx_status.status.rates[0].idx);
176                 break;
177         case RC_PID_EVENT_TYPE_RATE_CHANGE:
178                 p += snprintf(pb + p, length - p, "rate_change %d %d",
179                               ev->data.index, ev->data.rate);
180                 break;
181         case RC_PID_EVENT_TYPE_TX_RATE:
182                 p += snprintf(pb + p, length - p, "tx_rate %d %d",
183                               ev->data.index, ev->data.rate);
184                 break;
185         case RC_PID_EVENT_TYPE_PF_SAMPLE:
186                 p += snprintf(pb + p, length - p,
187                               "pf_sample %d %d %d %d",
188                               ev->data.pf_sample, ev->data.prop_err,
189                               ev->data.int_err, ev->data.der_err);
190                 break;
191         }
192         p += snprintf(pb + p, length - p, "\n");
193 
194         spin_unlock_irqrestore(&events->lock, status);
195 
196         if (copy_to_user(buf, pb, p))
197                 return -EFAULT;
198 
199         return p;
200 }
201 
202 #undef RC_PID_PRINT_BUF_SIZE
203 
204 static const struct file_operations rc_pid_fop_events = {
205         .owner = THIS_MODULE,
206         .read = rate_control_pid_events_read,
207         .poll = rate_control_pid_events_poll,
208         .open = rate_control_pid_events_open,
209         .release = rate_control_pid_events_release,
210         .llseek = noop_llseek,
211 };
212 
213 void rate_control_pid_add_sta_debugfs(void *priv, void *priv_sta,
214                                              struct dentry *dir)
215 {
216         struct rc_pid_sta_info *spinfo = priv_sta;
217 
218         spinfo->events_entry = debugfs_create_file("rc_pid_events", S_IRUGO,
219                                                    dir, spinfo,
220                                                    &rc_pid_fop_events);
221 }
222 
223 void rate_control_pid_remove_sta_debugfs(void *priv, void *priv_sta)
224 {
225         struct rc_pid_sta_info *spinfo = priv_sta;
226 
227         debugfs_remove(spinfo->events_entry);
228 }
229 

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