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@xxxxxxxxx>
---
include/net/mac80211.h | 18 ++++++++++++++++++
net/mac80211/ieee80211_i.h | 2 ++
net/mac80211/iface.c | 3 +++
net/mac80211/mlme.c | 39 ++++++++++++++++++++++++++++++++++++++-
4 files changed, 61 insertions(+), 1 deletions(-)
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 9ef131d..1262b83 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -888,6 +888,13 @@ enum ieee80211_tkip_key_type {
*
* @IEEE80211_HW_MFP_CAPABLE:
* Hardware supports management frame protection (MFP, IEEE 802.11w).
+ *
+ * @IEEE80211_HW_BEACON_FILTER: Hardware can drop similar beacon frames to
+ * avoid waking up cpu. Enabling this flag disables the beacon check
+ * in mac80211 when in power save mode and the hardware must have an
+ * event to notify that beacons are lost. Use ieee80211_beacon_loss()
+ * to notify the event to the stack. The filtering must be enabled
+ * only when IEEE80211_CONF_PS is set.
*/
enum ieee80211_hw_flags {
IEEE80211_HW_RX_INCLUDES_FCS = 1<<1,
@@ -903,6 +910,7 @@ 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,
};
/**
@@ -1981,6 +1989,16 @@ 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 that hardware does not receive beacons
+ *
+ * @hw: pointer as obtained from ieee80211_alloc_hw()
+ *
+ * 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_hw *hw);
/* Rate control API */
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 5d3d0bf..488c112 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -272,6 +272,7 @@ 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];
@@ -1083,6 +1084,7 @@ 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 2acc416..e0fa20f 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -470,6 +470,9 @@ 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 c235d39..053d75b 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -920,6 +920,41 @@ 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_hw *hw)
+{
+ struct ieee80211_local *local = hw_to_local(hw);
+ struct ieee80211_sub_if_data *sdata;
+
+ rcu_read_lock();
+ list_for_each_entry(sdata, &local->interfaces, list) {
+ if (sdata->vif.type != NL80211_IFTYPE_STATION)
+ continue;
+
+ queue_work(local->hw.workqueue,
+ &sdata->u.mgd.beacon_loss_work);
+ }
+ rcu_read_unlock();
+}
+EXPORT_SYMBOL(ieee80211_beacon_loss);
+
static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
@@ -954,7 +989,8 @@ static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
goto unlock;
}
- if (time_after(jiffies,
+ if (!(local->hw.flags & IEEE80211_HW_BEACON_FILTER) &&
+ time_after(jiffies,
ifmgd->last_beacon + IEEE80211_MONITORING_INTERVAL)) {
printk(KERN_DEBUG "%s: beacon loss from AP %pM "
"- sending probe request\n",
@@ -1839,6 +1875,7 @@ 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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