From ab13315af97919fae0e014748105fdc2e30afb2d Mon Sep 17 00:00:00 2001 From: Kalle Valo Date: Tue, 12 Jan 2010 10:42:31 +0200 Subject: mac80211: add U-APSD client support Add Unscheduled Automatic Power-Save Delivery (U-APSD) client support. The idea is that the data frames from the client trigger AP to send the buffered frames with ACs which have U-APSD enabled. This decreases latency and makes it possible to save even more power. Driver needs to use IEEE80211_HW_UAPSD to enable the feature. The current implementation assumes that firmware takes care of the wakeup and hardware needing IEEE80211_HW_PS_NULLFUNC_STACK is not yet supported. Tested with wl1251 on a Nokia N900 and Cisco Aironet 1231G AP and running various test traffic with ping. Signed-off-by: Kalle Valo Signed-off-by: John W. Linville --- net/mac80211/scan.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'net/mac80211/scan.c') diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c index 30cb62bb45b..9afe2f9885d 100644 --- a/net/mac80211/scan.c +++ b/net/mac80211/scan.c @@ -54,6 +54,23 @@ void ieee80211_rx_bss_put(struct ieee80211_local *local, cfg80211_put_bss(container_of((void *)bss, struct cfg80211_bss, priv)); } +static bool is_uapsd_supported(struct ieee802_11_elems *elems) +{ + u8 qos_info; + + if (elems->wmm_info && elems->wmm_info_len == 7 + && elems->wmm_info[5] == 1) + qos_info = elems->wmm_info[6]; + else if (elems->wmm_param && elems->wmm_param_len == 24 + && elems->wmm_param[5] == 1) + qos_info = elems->wmm_param[6]; + else + /* no valid wmm information or parameter element found */ + return false; + + return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; +} + struct ieee80211_bss * ieee80211_bss_info_update(struct ieee80211_local *local, struct ieee80211_rx_status *rx_status, @@ -117,6 +134,7 @@ ieee80211_bss_info_update(struct ieee80211_local *local, } bss->wmm_used = elems->wmm_param || elems->wmm_info; + bss->uapsd_supported = is_uapsd_supported(elems); if (!beacon) bss->last_probe_resp = jiffies; -- cgit