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/*
* Copyright 2007, Mattias Nissler <mattias.nissler@gmx.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/spinlock.h>
#include <linux/poll.h>
#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/skbuff.h>
#include <net/mac80211.h>
#include "ieee80211_rate.h"
#include "rc80211_pid.h"
static void rate_control_pid_event(struct rc_pid_event_buffer *buf,
enum rc_pid_event_type type,
union rc_pid_event_data *data)
{
struct rc_pid_event *ev;
unsigned long status;
spin_lock_irqsave(&buf->lock, status);
ev = &(buf->ring[buf->next_entry]);
buf->next_entry = (buf->next_entry + 1) % RC_PID_EVENT_RING_SIZE;
ev->timestamp = jiffies;
ev->id = buf->ev_count++;
ev->type = type;
ev->data = *data;
spin_unlock_irqrestore(&buf->lock, status);
wake_up_all(&buf->waitqueue);
}
void rate_control_pid_event_tx_status(struct rc_pid_event_buffer *buf,
struct ieee80211_tx_status *stat)
{
union rc_pid_event_data evd;
memcpy(&evd.tx_status, stat, sizeof(struct ieee80211_tx_status));
rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_STATUS, &evd);
}
void rate_control_pid_event_rate_change(struct rc_pid_event_buffer *buf,
int index, int rate)
{
union rc_pid_event_data evd;
evd.index = index;
evd.rate = rate;
rate_control_pid_event(buf, RC_PID_EVENT_TYPE_RATE_CHANGE, &evd);
}
void rate_control_pid_event_tx_rate(struct rc_pid_event_buffer *buf,
int index, int rate)
{
union rc_pid_event_data evd;
evd.index = index;
evd.rate = rate;
rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_RATE, &evd);
}
void rate_control_pid_event_pf_sample(struct rc_pid_event_buffer *buf,
s32 pf_sample, s32 prop_err,
s32 int_err, s32 der_err)
{
union rc_pid_event_data evd;
evd.pf_sample = pf_sample;
evd.prop_err = prop_err;
evd.int_err = int_err;
evd.der_err = der_err;
rate_control_pid_event(buf, RC_PID_EVENT_TYPE_PF_SAMPLE, &evd);
}
static int rate_control_pid_events_open(struct inode *inode, struct file *file)
{
struct rc_pid_sta_info *sinfo = inode->i_private;
struct rc_pid_event_buffer *events = &sinfo->events;
struct rc_pid_events_file_info *file_info;
unsigned int status;
/* Allocate a state struct */
file_info = kmalloc(sizeof(*file_info), GFP_KERNEL);
if (file_info == NULL)
return -ENOMEM;
spin_lock_irqsave(&events->lock, status);
file_info->next_entry = events->next_entry;
file_info->events = events;
spin_unlock_irqrestore(&events->lock, status);
file->private_data = file_info;
return 0;
}
static int rate_control_pid_events_release(struct inode *inode,
struct file *file)
{
struct rc_pid_events_file_info *file_info = file->private_data;
kfree(file_info);
return 0;
}
static unsigned int rate_control_pid_events_poll(struct file *file,
poll_table *wait)
{
struct rc_pid_events_file_info *file_info = file->private_data;
poll_wait(file, &file_info->events->waitqueue, wait);
return POLLIN | POLLRDNORM;
}
#define RC_PID_PRINT_BUF_SIZE 64
static ssize_t rate_control_pid_events_read(struct file *file, char __user *buf,
size_t length, loff_t *offset)
{
struct rc_pid_events_file_info *file_info = file->private_data;
struct rc_pid_event_buffer *events = file_info->events;
struct rc_pid_event *ev;
char pb[RC_PID_PRINT_BUF_SIZE];
int ret;
int p;
unsigned int status;
/* Check if there is something to read. */
if (events->next_entry == file_info->next_entry) {
if (file->f_flags & O_NONBLOCK)
return -EAGAIN;
/* Wait */
ret = wait_event_interruptible(events->waitqueue,
events->next_entry != file_info->next_entry);
if (ret)
return ret;
}
/* Write out one event per call. I don't care whether it's a little
* inefficient, this is debugging code anyway. */
spin_lock_irqsave(&events->lock, status);
/* Get an event */
ev = &(events->ring[file_info->next_entry]);
file_info->next_entry = (file_info->next_entry + 1) %
RC_PID_EVENT_RING_SIZE;
/* Print information about the event. Note that userpace needs to
* provide large enough buffers. */
length = length < RC_PID_PRINT_BUF_SIZE ?
length : RC_PID_PRINT_BUF_SIZE;
p = snprintf(pb, length, "%u %lu ", ev->id, ev->timestamp);
switch (ev->type) {
case RC_PID_EVENT_TYPE_TX_STATUS:
p += snprintf(pb + p, length - p, "tx_status %u %u",
ev->data.tx_status.excessive_retries,
ev->data.tx_status.retry_count);
break;
case RC_PID_EVENT_TYPE_RATE_CHANGE:
p += snprintf(pb + p, length - p, "rate_change %d %d",
ev->data.index, ev->data.rate);
break;
case RC_PID_EVENT_TYPE_TX_RATE:
p += snprintf(pb + p, length - p, "tx_rate %d %d",
ev->data.index, ev->data.rate);
break;
case RC_PID_EVENT_TYPE_PF_SAMPLE:
p += snprintf(pb + p, length - p,
"pf_sample %d %d %d %d",
ev->data.pf_sample, ev->data.prop_err,
ev->data.int_err, ev->data.der_err);
break;
}
p += snprintf(pb + p, length - p, "\n");
spin_unlock_irqrestore(&events->lock, status);
if (copy_to_user(buf, pb, p))
return -EFAULT;
return p;
}
#undef RC_PID_PRINT_BUF_SIZE
struct file_operations rc_pid_fop_events = {
.owner = THIS_MODULE,
.read = rate_control_pid_events_read,
.poll = rate_control_pid_events_poll,
.open = rate_control_pid_events_open,
.release = rate_control_pid_events_release,
};
void rate_control_pid_add_sta_debugfs(void *priv, void *priv_sta,
struct dentry *dir)
{
struct rc_pid_sta_info *spinfo = priv_sta;
spinfo->events_entry = debugfs_create_file("rc_pid_events", S_IRUGO,
dir, spinfo,
&rc_pid_fop_events);
}
void rate_control_pid_remove_sta_debugfs(void *priv, void *priv_sta)
{
struct rc_pid_sta_info *spinfo = priv_sta;
debugfs_remove(spinfo->events_entry);
}
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