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nl80211/mac80211: Report signal average

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Extend nl80211 to report an exponential weighted moving average (EWMA) of the
signal value. Since the signal value usually fluctuates between different
packets, an average can be more useful than the value of the last packet.

This uses the recently added generic EWMA library function.

--
v2:	fix ABI breakage and change factor to be a power of 2.

Signed-off-by: Bruno Randolf <[email protected]>
Signed-off-by: John W. Linville <[email protected]>
This commit is contained in:
Bruno Randolf 2010-12-02 19:12:43 +09:00 • committed by John W. Linville
commit 541a45a142
8 changed files with 18 additions and 1 deletions
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3
net/wireless/nl80211.c
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@ -1896,6 +1896,9 @@ static int nl80211_send_station(struct sk_buff *msg, u32 pid, u32 seq,
if (sinfo->filled & STATION_INFO_SIGNAL)
NLA_PUT_U8(msg, NL80211_STA_INFO_SIGNAL,
sinfo->signal);
if (sinfo->filled & STATION_INFO_SIGNAL_AVG)
NLA_PUT_U8(msg, NL80211_STA_INFO_SIGNAL_AVG,
sinfo->signal_avg);
if (sinfo->filled & STATION_INFO_TX_BITRATE) {
txrate = nla_nest_start(msg, NL80211_STA_INFO_TX_BITRATE);
if (!txrate)