Commit ab13315a authored by Kalle Valo's avatar Kalle Valo Committed by John W. Linville
Browse files

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: default avatarKalle Valo <kalle.valo@nokia.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 2d46d7c1

include/linux/ieee80211.h

+18 −0
Original line number Diff line number Diff line
@@ -120,6 +120,24 @@ 
#define IEEE80211_QOS_CTL_TID_MASK	0x000F

#define IEEE80211_QOS_CTL_TAG1D_MASK	0x0007



/* U-APSD queue for WMM IEs sent by AP */

#define IEEE80211_WMM_IE_AP_QOSINFO_UAPSD	(1<<7)



/* U-APSD queues for WMM IEs sent by STA */

#define IEEE80211_WMM_IE_STA_QOSINFO_AC_VO	(1<<0)

#define IEEE80211_WMM_IE_STA_QOSINFO_AC_VI	(1<<1)

#define IEEE80211_WMM_IE_STA_QOSINFO_AC_BK	(1<<2)

#define IEEE80211_WMM_IE_STA_QOSINFO_AC_BE	(1<<3)

#define IEEE80211_WMM_IE_STA_QOSINFO_AC_MASK	0x0f



/* U-APSD max SP length for WMM IEs sent by STA */

#define IEEE80211_WMM_IE_STA_QOSINFO_SP_ALL	0x00

#define IEEE80211_WMM_IE_STA_QOSINFO_SP_2	0x01

#define IEEE80211_WMM_IE_STA_QOSINFO_SP_4	0x02

#define IEEE80211_WMM_IE_STA_QOSINFO_SP_6	0x03

#define IEEE80211_WMM_IE_STA_QOSINFO_SP_MASK	0x03

#define IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT	5



struct ieee80211_hdr {

	__le16 frame_control;

	__le16 duration_id;

include/net/mac80211.h

+7 −0
Original line number Diff line number Diff line
@@ -113,6 +113,7 @@ struct ieee80211_tx_queue_params { 
	u16 cw_min;

	u16 cw_max;

	u8 aifs;

	bool uapsd;

};



/**
@@ -929,6 +930,11 @@ enum ieee80211_tkip_key_type { 
 *	Hardware supports dynamic spatial multiplexing powersave,

 *	ie. can turn off all but one chain and then wake the rest

 *	up as required after, for example, rts/cts handshake.

 *

 * @IEEE80211_HW_SUPPORTS_UAPSD:

 *	Hardware supports Unscheduled Automatic Power Save Delivery

 *	(U-APSD) in managed mode. The mode is configured with

 *	conf_tx() operation.

 */

enum ieee80211_hw_flags {

	IEEE80211_HW_HAS_RATE_CONTROL			= 1<<0,
@@ -948,6 +954,7 @@ enum ieee80211_hw_flags { 
	IEEE80211_HW_BEACON_FILTER			= 1<<14,

	IEEE80211_HW_SUPPORTS_STATIC_SMPS		= 1<<15,

	IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS		= 1<<16,

	IEEE80211_HW_SUPPORTS_UAPSD			= 1<<17,

};



/**

net/mac80211/cfg.c

+7 −0
Original line number Diff line number Diff line
@@ -1128,6 +1128,13 @@ static int ieee80211_set_txq_params(struct wiphy *wiphy, 
	p.cw_max = params->cwmax;

	p.cw_min = params->cwmin;

	p.txop = params->txop;



	/*

	 * Setting tx queue params disables u-apsd because it's only

	 * called in master mode.

	 */

	p.uapsd = false;



	if (drv_conf_tx(local, params->queue, &p)) {

		printk(KERN_DEBUG "%s: failed to set TX queue "

		       "parameters for queue %d\n",

net/mac80211/ieee80211_i.h

+12 −1
Original line number Diff line number Diff line
@@ -58,6 +58,15 @@ struct ieee80211_local; 


#define TU_TO_EXP_TIME(x)	(jiffies + usecs_to_jiffies((x) * 1024))



#define IEEE80211_DEFAULT_UAPSD_QUEUES \

	(IEEE80211_WMM_IE_STA_QOSINFO_AC_BK |	\

	 IEEE80211_WMM_IE_STA_QOSINFO_AC_BE |	\

	 IEEE80211_WMM_IE_STA_QOSINFO_AC_VI |	\

	 IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)



#define IEEE80211_DEFAULT_MAX_SP_LEN		\

	IEEE80211_WMM_IE_STA_QOSINFO_SP_ALL



struct ieee80211_fragment_entry {

	unsigned long first_frag_time;

	unsigned int seq;
@@ -78,6 +87,7 @@ struct ieee80211_bss { 
	u8 dtim_period;



	bool wmm_used;

	bool uapsd_supported;



	unsigned long last_probe_resp;
@@ -285,7 +295,7 @@ struct ieee80211_work { 
			u8 ssid[IEEE80211_MAX_SSID_LEN];

			u8 ssid_len;

			u8 supp_rates_len;

			bool wmm_used, use_11n;

			bool wmm_used, use_11n, uapsd_used;

		} assoc;

		struct {

			u32 duration;
@@ -306,6 +316,7 @@ enum ieee80211_sta_flags { 
	IEEE80211_STA_DISABLE_11N	= BIT(4),

	IEEE80211_STA_CSA_RECEIVED	= BIT(5),

	IEEE80211_STA_MFP_ENABLED	= BIT(6),

	IEEE80211_STA_UAPSD_ENABLED	= BIT(7),

};



struct ieee80211_if_managed {

net/mac80211/main.c

+4 −0
Original line number Diff line number Diff line
@@ -491,6 +491,10 @@ int ieee80211_register_hw(struct ieee80211_hw *hw) 
	else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)

		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;



	WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)

	     && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),

	     "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");



	/*

	 * Calculate scan IE length -- we need this to alloc

	 * memory and to subtract from the driver limit. It

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