net/mac80211/rc80211_pid_debugfs.c

   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
  16 #include <net/mac80211.h>
  17 #include "rate.h"
  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,
  43                                       struct ieee80211_tx_info *stat)
  44 {
  45         union rc_pid_event_data evd;
  46
  47         evd.flags = stat->flags;
  48         memcpy(&evd.tx_status, stat, sizeof(struct ieee80211_tx_info));
  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;
  90         unsigned long status;
  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;
 140         unsigned long status;
 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",
 172                               !(ev->data.flags & IEEE80211_TX_STAT_ACK),
 173                               ev->data.tx_status.status.rates[0].idx);
 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
 202 static const struct file_operations rc_pid_fop_events = {
 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 }