Commit 04de8381 authored by Kalle Valo's avatar Kalle Valo Committed by John W. Linville
Browse files

mac80211: add beacon filtering support 



Add IEEE80211_HW_BEACON_FILTERING flag so that driver inform that it supports
beacon filtering. Drivers need to call the new function
ieee80211_beacon_loss() to notify about beacon loss.

Signed-off-by: default avatarKalle Valo <kalle.valo@nokia.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent a08c1c1a

Documentation/DocBook/mac80211.tmpl

+6 −0
Original line number Diff line number Diff line
@@ -227,6 +227,12 @@ usage should require reading the full document. 
!Pinclude/net/mac80211.h Powersave support

    </chapter>



    <chapter id="beacon-filter">

      <title>Beacon filter support</title>

!Pinclude/net/mac80211.h Beacon filter support

!Finclude/net/mac80211.h ieee80211_beacon_loss

    </chapter>



    <chapter id="qos">

      <title>Multiple queues and QoS support</title>

      <para>TBD</para>

include/net/mac80211.h

+33 −0
Original line number Diff line number Diff line
@@ -882,6 +882,10 @@ enum ieee80211_tkip_key_type { 
 *

 * @IEEE80211_HW_MFP_CAPABLE:

 *	Hardware supports management frame protection (MFP, IEEE 802.11w).

 *

 * @IEEE80211_HW_BEACON_FILTER:

 *	Hardware supports dropping of irrelevant beacon frames to

 *	avoid waking up cpu.

 */

enum ieee80211_hw_flags {

	IEEE80211_HW_RX_INCLUDES_FCS			= 1<<1,
@@ -897,6 +901,7 @@ enum ieee80211_hw_flags { 
	IEEE80211_HW_PS_NULLFUNC_STACK			= 1<<11,

	IEEE80211_HW_SUPPORTS_DYNAMIC_PS		= 1<<12,

	IEEE80211_HW_MFP_CAPABLE			= 1<<13,

	IEEE80211_HW_BEACON_FILTER			= 1<<14,

};



/**
@@ -1120,6 +1125,24 @@ ieee80211_get_alt_retry_rate(const struct ieee80211_hw *hw, 
 * value, or by the stack if all nullfunc handling is in the stack.

 */



/**

 * DOC: Beacon filter support

 *

 * Some hardware have beacon filter support to reduce host cpu wakeups

 * which will reduce system power consumption. It usuallly works so that

 * the firmware creates a checksum of the beacon but omits all constantly

 * changing elements (TSF, TIM etc). Whenever the checksum changes the

 * beacon is forwarded to the host, otherwise it will be just dropped. That

 * way the host will only receive beacons where some relevant information

 * (for example ERP protection or WMM settings) have changed.

 *

 * Beacon filter support is informed with %IEEE80211_HW_BEACON_FILTER flag.

 * The driver needs to enable beacon filter support whenever power save is

 * enabled, that is %IEEE80211_CONF_PS is set. When power save is enabled,

 * the stack will not check for beacon miss at all and the driver needs to

 * notify about complete loss of beacons with ieee80211_beacon_loss().

 */



/**

 * DOC: Frame filtering

 *
@@ -1970,6 +1993,16 @@ void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, const u8 *ra, 
struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_hw *hw,

					 const u8 *addr);



/**

 * ieee80211_beacon_loss - inform hardware does not receive beacons

 *

 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.

 *

 * When beacon filtering is enabled with IEEE80211_HW_BEACON_FILTERING and

 * IEEE80211_CONF_PS is set, the driver needs to inform whenever the

 * hardware is not receiving beacons with this function.

 */

void ieee80211_beacon_loss(struct ieee80211_vif *vif);



/* Rate control API */

net/mac80211/ieee80211_i.h

+2 −0
Original line number Diff line number Diff line
@@ -275,6 +275,7 @@ struct ieee80211_if_managed { 
	struct timer_list chswitch_timer;

	struct work_struct work;

	struct work_struct chswitch_work;

	struct work_struct beacon_loss_work;



	u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
@@ -1086,6 +1087,7 @@ void ieee80211_send_nullfunc(struct ieee80211_local *local, 
			     int powersave);

void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,

			     struct ieee80211_hdr *hdr);

void ieee80211_beacon_loss_work(struct work_struct *work);



void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,

				     enum queue_stop_reason reason);

net/mac80211/iface.c

+3 −0
Original line number Diff line number Diff line
@@ -477,6 +477,9 @@ static int ieee80211_stop(struct net_device *dev) 
		 */

		cancel_work_sync(&sdata->u.mgd.work);

		cancel_work_sync(&sdata->u.mgd.chswitch_work);



		cancel_work_sync(&sdata->u.mgd.beacon_loss_work);



		/*

		 * When we get here, the interface is marked down.

		 * Call synchronize_rcu() to wait for the RX path

net/mac80211/mlme.c

+48 −1
Original line number Diff line number Diff line
@@ -610,6 +610,8 @@ static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 
		bss_info_changed |= ieee80211_handle_bss_capability(sdata,

			bss->cbss.capability, bss->has_erp_value, bss->erp_value);



		cfg80211_hold_bss(&bss->cbss);



		ieee80211_rx_bss_put(local, bss);

	}
@@ -751,6 +753,8 @@ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 
{

	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

	struct ieee80211_local *local = sdata->local;

	struct ieee80211_conf *conf = &local_to_hw(local)->conf;

	struct ieee80211_bss *bss;

	struct sta_info *sta;

	u32 changed = 0, config_changed = 0;
@@ -774,6 +778,15 @@ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 


	ieee80211_sta_tear_down_BA_sessions(sta);



	bss = ieee80211_rx_bss_get(local, ifmgd->bssid,

				   conf->channel->center_freq,

				   ifmgd->ssid, ifmgd->ssid_len);



	if (bss) {

		cfg80211_unhold_bss(&bss->cbss);

		ieee80211_rx_bss_put(local, bss);

	}



	if (self_disconnected) {

		if (deauth)

			ieee80211_send_deauth_disassoc(sdata,
@@ -925,6 +938,33 @@ void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, 
			  jiffies + IEEE80211_MONITORING_INTERVAL);

}



void ieee80211_beacon_loss_work(struct work_struct *work)

{

	struct ieee80211_sub_if_data *sdata =

		container_of(work, struct ieee80211_sub_if_data,

			     u.mgd.beacon_loss_work);

	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;



	printk(KERN_DEBUG "%s: driver reports beacon loss from AP %pM "

	       "- sending probe request\n", sdata->dev->name,

	       sdata->u.mgd.bssid);



	ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;

	ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,

				 ifmgd->ssid_len, NULL, 0);



	mod_timer(&ifmgd->timer, jiffies + IEEE80211_MONITORING_INTERVAL);

}



void ieee80211_beacon_loss(struct ieee80211_vif *vif)

{

	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);



	queue_work(sdata->local->hw.workqueue,

		   &sdata->u.mgd.beacon_loss_work);

}

EXPORT_SYMBOL(ieee80211_beacon_loss);



static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)

{

	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
@@ -959,7 +999,13 @@ static void ieee80211_associated(struct ieee80211_sub_if_data *sdata) 
		goto unlock;

	}



	if (time_after(jiffies,

	/*

	 * Beacon filtering is only enabled with power save and then the

	 * stack should not check for beacon loss.

	 */

	if (!((local->hw.flags & IEEE80211_HW_BEACON_FILTER) &&

	      (local->hw.conf.flags & IEEE80211_CONF_PS)) &&

	    time_after(jiffies,

		       ifmgd->last_beacon + IEEE80211_MONITORING_INTERVAL)) {

		printk(KERN_DEBUG "%s: beacon loss from AP %pM "

		       "- sending probe request\n",
@@ -1869,6 +1915,7 @@ void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 
	ifmgd = &sdata->u.mgd;

	INIT_WORK(&ifmgd->work, ieee80211_sta_work);

	INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);

	INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);

	setup_timer(&ifmgd->timer, ieee80211_sta_timer,

		    (unsigned long) sdata);

	setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,

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