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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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33
include/net/mac80211.h
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@@ -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 */