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mac80211: add beacon filtering support

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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: Kalle Valo <kalle.valo@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Kalle Valo 2009-03-22 21:57:35 +02:00 committed by John W. Linville
parent a08c1c1ac0
commit 04de838159
5 changed files with 92 additions and 1 deletions
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6
Documentation/DocBook/mac80211.tmpl
View File

@ -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>

33
include/net/mac80211.h
View File

@ -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 */

2
net/mac80211/ieee80211_i.h
View File

@ -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);

3
net/mac80211/iface.c
View File

@ -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

49
net/mac80211/mlme.c
View File

@ -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,