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