From 04de83815993714a7ba2618f637fa1092a5f664b Mon Sep 17 00:00:00 2001 From: Kalle Valo Date: Sun, 22 Mar 2009 21:57:35 +0200 Subject: [PATCH] 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: Kalle Valo Signed-off-by: John W. Linville --- Documentation/DocBook/mac80211.tmpl | 6 ++++ include/net/mac80211.h | 33 +++++++++++++++++++ net/mac80211/ieee80211_i.h | 2 ++ net/mac80211/iface.c | 3 ++ net/mac80211/mlme.c | 49 ++++++++++++++++++++++++++++- 5 files changed, 92 insertions(+), 1 deletion(-) diff --git a/Documentation/DocBook/mac80211.tmpl b/Documentation/DocBook/mac80211.tmpl index 8af6d962687..fbeaffc1dcc 100644 --- a/Documentation/DocBook/mac80211.tmpl +++ b/Documentation/DocBook/mac80211.tmpl @@ -227,6 +227,12 @@ usage should require reading the full document. !Pinclude/net/mac80211.h Powersave support + + Beacon filter support +!Pinclude/net/mac80211.h Beacon filter support +!Finclude/net/mac80211.h ieee80211_beacon_loss + + Multiple queues and QoS support TBD diff --git a/include/net/mac80211.h b/include/net/mac80211.h index 174dc1d7526..d881ed8ad2c 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -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 */ diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index 8a617a7fc09..acba78e1a5c 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -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); diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c index dd2a276fa8c..91e8e1bacaa 100644 --- a/net/mac80211/iface.c +++ b/net/mac80211/iface.c @@ -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 diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index 8f30f4d19da..7ecda9d59d8 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -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, -- 2.41.0