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mac80211: Do not generate CQM events based on first Beacon frames 

The signal strength value in a single RX frame is not that reliable,
so it is better to delay start of CQM events until there is a real
average signal strength from more than a single Beacon frame
available.

Signed-off-by: Jouni Malinen <j@w1.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Jouni Malinen 2010-08-27 22:22:00 +03:00 committed by John W. Linville
parent 3ba06c6fbd
commit 391a200a89
2 changed files with 16 additions and 0 deletions
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7
net/mac80211/ieee80211_i.h
View File

@ -368,6 +368,13 @@ struct ieee80211_if_managed {
*/
int ave_beacon_signal;
/*
* Number of Beacon frames used in ave_beacon_signal. This can be used
* to avoid generating less reliable cqm events that would be based
* only on couple of received frames.
*/
unsigned int count_beacon_signal;
/*
* Last Beacon frame signal strength average (ave_beacon_signal / 16)
* that triggered a cqm event. 0 indicates that no event has been

9
net/mac80211/mlme.c
View File

@ -54,6 +54,12 @@
*/
#define IEEE80211_SIGNAL_AVE_WEIGHT 3
/*
* How many Beacon frames need to have been used in average signal strength
* before starting to indicate signal change events.
*/
#define IEEE80211_SIGNAL_AVE_MIN_COUNT 4
#define TMR_RUNNING_TIMER 0
#define TMR_RUNNING_CHANSW 1
@ -1555,13 +1561,16 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
ifmgd->ave_beacon_signal = rx_status->signal * 16;
ifmgd->last_cqm_event_signal = 0;
ifmgd->count_beacon_signal = 1;
} else {
ifmgd->ave_beacon_signal =
(IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
(16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
ifmgd->ave_beacon_signal) / 16;
ifmgd->count_beacon_signal++;
}
if (bss_conf->cqm_rssi_thold &&
ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
!(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
int sig = ifmgd->ave_beacon_signal / 16;
int last_event = ifmgd->last_cqm_event_signal;