/*
|
* BSS Load Element / Channel Utilization
|
* Copyright (c) 2014, Qualcomm Atheros, Inc.
|
*
|
* This software may be distributed under the terms of the BSD license.
|
* See README for more details.
|
*/
|
|
#include "utils/includes.h"
|
|
#include "utils/common.h"
|
#include "utils/eloop.h"
|
#include "hostapd.h"
|
#include "bss_load.h"
|
#include "ap_drv_ops.h"
|
#include "beacon.h"
|
|
|
static int get_bss_load_update_timeout(struct hostapd_data *hapd,
|
unsigned int *sec, unsigned int *usec)
|
{
|
unsigned int update_period = hapd->conf->bss_load_update_period;
|
unsigned int beacon_int = hapd->iconf->beacon_int;
|
unsigned int update_timeout;
|
|
if (!update_period || !beacon_int) {
|
wpa_printf(MSG_ERROR,
|
"BSS Load: Invalid BSS load update configuration (period=%u beacon_int=%u)",
|
update_period, beacon_int);
|
return -1;
|
}
|
|
update_timeout = update_period * beacon_int;
|
|
*sec = ((update_timeout / 1000) * 1024) / 1000;
|
*usec = (update_timeout % 1000) * 1024;
|
|
return 0;
|
}
|
|
|
static void update_channel_utilization(void *eloop_data, void *user_data)
|
{
|
struct hostapd_data *hapd = eloop_data;
|
unsigned int sec, usec;
|
int err;
|
struct hostapd_iface *iface = hapd->iface;
|
|
if (!(hapd->beacon_set_done && hapd->started))
|
return;
|
|
err = hostapd_drv_get_survey(hapd, hapd->iface->freq);
|
if (err) {
|
wpa_printf(MSG_ERROR, "BSS Load: Failed to get survey data");
|
return;
|
}
|
|
ieee802_11_set_beacon(hapd);
|
|
if (get_bss_load_update_timeout(hapd, &sec, &usec) < 0)
|
return;
|
|
if (hapd->conf->chan_util_avg_period) {
|
iface->chan_util_samples_sum += iface->channel_utilization;
|
iface->chan_util_num_sample_periods +=
|
hapd->conf->bss_load_update_period;
|
if (iface->chan_util_num_sample_periods >=
|
hapd->conf->chan_util_avg_period) {
|
iface->chan_util_average =
|
iface->chan_util_samples_sum /
|
(iface->chan_util_num_sample_periods /
|
hapd->conf->bss_load_update_period);
|
iface->chan_util_samples_sum = 0;
|
iface->chan_util_num_sample_periods = 0;
|
}
|
}
|
|
eloop_register_timeout(sec, usec, update_channel_utilization, hapd,
|
NULL);
|
}
|
|
|
int bss_load_update_init(struct hostapd_data *hapd)
|
{
|
unsigned int sec, usec;
|
|
if (get_bss_load_update_timeout(hapd, &sec, &usec) < 0)
|
return -1;
|
|
eloop_register_timeout(sec, usec, update_channel_utilization, hapd,
|
NULL);
|
return 0;
|
}
|
|
|
void bss_load_update_deinit(struct hostapd_data *hapd)
|
{
|
eloop_cancel_timeout(update_channel_utilization, hapd, NULL);
|
}
|
