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mac80211: add U-APSD client support

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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 <kalle.valo@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Kalle Valo
2010-01-12 10:42:31 +02:00
committed by John W. Linville
parent 2d46d7c121
commit ab13315af9
9 changed files with 106 additions and 6 deletions
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12
net/mac80211/work.c
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@ -202,7 +202,7 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
struct ieee80211_local *local = sdata->local;
struct sk_buff *skb;
struct ieee80211_mgmt *mgmt;
u8 *pos;
u8 *pos, qos_info;
const u8 *ies;
size_t offset = 0, noffset;
int i, len, count, rates_len, supp_rates_len;
@ -375,6 +375,14 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
}
if (wk->assoc.wmm_used && local->hw.queues >= 4) {
if (wk->assoc.uapsd_used) {
qos_info = IEEE80211_DEFAULT_UAPSD_QUEUES;
qos_info |= (IEEE80211_DEFAULT_MAX_SP_LEN <<
IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
} else {
qos_info = 0;
}
pos = skb_put(skb, 9);
*pos++ = WLAN_EID_VENDOR_SPECIFIC;
*pos++ = 7; /* len */
@ -384,7 +392,7 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
*pos++ = 2; /* WME */
*pos++ = 0; /* WME info */
*pos++ = 1; /* WME ver */
*pos++ = 0;
*pos++ = qos_info;
}
/* add any remaining custom (i.e. vendor specific here) IEs */