mac80211: Stop BA session event from device

Some devices support BT/WLAN co-existence algorigthms.
In order not to harm the system performance and user experience, the device
requests not to allow any RX BA session and tear down existing RX BA sessions
based on system constraints such as periodic BT activity that needs to limit
WLAN activity (eg.SCO or A2DP).
In such cases, the intention is to limit the duration of the RX PPDU and
therefore prevent the peer device to use A-MPDU aggregation.

Adding ieee80211_stop_rx_ba_session() callback
that can be used by the driver to stop existing BA sessions.

Signed-off-by: Shahar Levi <shahar_levi@ti.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/net/mac80211/agg-rx.c b/net/mac80211/agg-rx.c
index 9c0d76cdca92..89b0b2ca6db6 100644
--- a/net/mac80211/agg-rx.c
+++ b/net/mac80211/agg-rx.c
@@ -100,6 +100,21 @@ void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
         mutex_unlock(&sta->ampdu_mlme.mtx);
 }
 
+void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap,
+                                  const u8 *addr)
+{
+        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
+        struct sta_info *sta = sta_info_get(sdata, addr);
+        int i;
+
+        for (i = 0; i < STA_TID_NUM; i++)
+                if (ba_rx_bitmap & BIT(i))
+                        set_bit(i, sta->ampdu_mlme.tid_rx_stop_requested);
+
+        ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
+}
+EXPORT_SYMBOL(ieee80211_stop_rx_ba_session);
+
 /*
  * After accepting the AddBA Request we activated a timer,
  * resetting it after each frame that arrives from the originator.