mac80211: add a function for setting the TIM bit for a specific station
This allows a driver to buffer frames for a PS station and tell mac80211
to wake it up even though mac80211 does not have any buffered frames for
it.
This is necessary for properly handling aggregation related buffering,
in ath9k, because the driver needs to keep its frames in order to keep
track of the Block-ACK window.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 8a9068a..7c5c6da 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -612,7 +612,8 @@
#endif
dev_kfree_skb(skb);
- if (skb_queue_empty(&sta->ps_tx_buf))
+ if (skb_queue_empty(&sta->ps_tx_buf) &&
+ !test_sta_flags(sta, WLAN_STA_PS_DRIVER_BUF))
sta_info_clear_tim_bit(sta);
}
@@ -896,6 +897,7 @@
struct ieee80211_local *local = sdata->local;
int sent, buffered;
+ clear_sta_flags(sta, WLAN_STA_PS_DRIVER_BUF);
if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
@@ -988,3 +990,12 @@
ieee80211_queue_work(hw, &sta->drv_unblock_wk);
}
EXPORT_SYMBOL(ieee80211_sta_block_awake);
+
+void ieee80211_sta_set_tim(struct ieee80211_sta *pubsta)
+{
+ struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
+
+ set_sta_flags(sta, WLAN_STA_PS_DRIVER_BUF);
+ sta_info_set_tim_bit(sta);
+}
+EXPORT_SYMBOL(ieee80211_sta_set_tim);
diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h
index 984a03d..af1a7f8 100644
--- a/net/mac80211/sta_info.h
+++ b/net/mac80211/sta_info.h
@@ -43,6 +43,8 @@
* be in the queues
* @WLAN_STA_PSPOLL: Station sent PS-poll while driver was keeping
* station in power-save mode, reply when the driver unblocks.
+ * @WLAN_STA_PS_DRIVER_BUF: Station has frames pending in driver internal
+ * buffers. Automatically cleared on station wake-up.
*/
enum ieee80211_sta_info_flags {
WLAN_STA_AUTH = 1<<0,
@@ -58,6 +60,7 @@
WLAN_STA_BLOCK_BA = 1<<11,
WLAN_STA_PS_DRIVER = 1<<12,
WLAN_STA_PSPOLL = 1<<13,
+ WLAN_STA_PS_DRIVER_BUF = 1<<14,
};
#define STA_TID_NUM 16