bss_load.c revision 281681 
1/*
2 * BSS Load Element / Channel Utilization
3 * Copyright (c) 2014, Qualcomm Atheros, Inc.
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9#include "utils/includes.h"
10
11#include "utils/common.h"
12#include "utils/eloop.h"
13#include "hostapd.h"
14#include "bss_load.h"
15#include "ap_drv_ops.h"
16#include "beacon.h"
17
18
19static void update_channel_utilization(void *eloop_data, void *user_data)
20{
21	struct hostapd_data *hapd = eloop_data;
22	unsigned int sec, usec;
23	int err;
24
25	if (!(hapd->beacon_set_done && hapd->started))
26		return;
27
28	err = hostapd_drv_get_survey(hapd, hapd->iface->freq);
29	if (err) {
30		wpa_printf(MSG_ERROR, "BSS Load: Failed to get survey data");
31		return;
32	}
33
34	ieee802_11_set_beacon(hapd);
35
36	sec = ((hapd->bss_load_update_timeout / 1000) * 1024) / 1000;
37	usec = (hapd->bss_load_update_timeout % 1000) * 1024;
38	eloop_register_timeout(sec, usec, update_channel_utilization, hapd,
39			       NULL);
40}
41
42
43int bss_load_update_init(struct hostapd_data *hapd)
44{
45	struct hostapd_bss_config *conf = hapd->conf;
46	struct hostapd_config *iconf = hapd->iconf;
47	unsigned int sec, usec;
48
49	if (!conf->bss_load_update_period || !iconf->beacon_int)
50		return -1;
51
52	hapd->bss_load_update_timeout = conf->bss_load_update_period *
53					iconf->beacon_int;
54	sec = ((hapd->bss_load_update_timeout / 1000) * 1024) / 1000;
55	usec = (hapd->bss_load_update_timeout % 1000) * 1024;
56	eloop_register_timeout(sec, usec, update_channel_utilization, hapd,
57			       NULL);
58	return 0;
59}
60
61
62void bss_load_update_deinit(struct hostapd_data *hapd)
63{
64	eloop_cancel_timeout(update_channel_utilization, hapd, NULL);
65}
66