mac80211: explicitly notify drivers of frame release
iwlwifi needs to know the number of frames that are
going to be sent to a station while it is asleep so
it can properly handle the uCode blocking of that
station.
Before uAPSD, we got by by telling the device that
a single frame was going to be released whenever we
encountered IEEE80211_TX_CTL_POLL_RESPONSE. With
uAPSD, however, that is no longer possible since
there could be more than a single frame.
To support this model, add a new callback to notify
drivers when frames are going to be released.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index ee6449e..778572d 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1973,6 +1973,18 @@
* service period ends, the driver must set %IEEE80211_TX_STATUS_EOSP
* on the last frame in the SP.
* This callback must be atomic.
+ * @allow_buffered_frames: Prepare device to allow the given number of frames
+ * to go out to the given station. The frames will be sent by mac80211
+ * via the usual TX path after this call. The TX information for frames
+ * released will also have the %IEEE80211_TX_CTL_POLL_RESPONSE flag set
+ * and the last one will also have %IEEE80211_TX_STATUS_EOSP set. In case
+ * frames from multiple TIDs are released and the driver might reorder
+ * them between the TIDs, it must set the %IEEE80211_TX_STATUS_EOSP flag
+ * on the last frame and clear it on all others and also handle the EOSP
+ * bit in the QoS header correctly.
+ * The @tids parameter is a bitmap and tells the driver which TIDs the
+ * frames will be on; it will at most have two bits set.
+ * This callback must be atomic.
*/
struct ieee80211_ops {
void (*tx)(struct ieee80211_hw *hw, struct sk_buff *skb);
@@ -2088,6 +2100,11 @@
void (*rssi_callback)(struct ieee80211_hw *hw,
enum ieee80211_rssi_event rssi_event);
+ void (*allow_buffered_frames)(struct ieee80211_hw *hw,
+ struct ieee80211_sta *sta,
+ u16 tids, int num_frames,
+ enum ieee80211_frame_release_type reason,
+ bool more_data);
void (*release_buffered_frames)(struct ieee80211_hw *hw,
struct ieee80211_sta *sta,
u16 tids, int num_frames,
