mac80211: introduce flush operation

We've long lacked a good confirmation that frames
have really gone out, e.g. before going off-channel
for a scan. Add a flush() operation that drivers
can implement to provide that confirmation, and use
it in a few places:
 * before scanning sends the nullfunc frames
 * after scanning sends the nullfunc frames, if any
 * when going idle, to send any pending frames

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 494ac69ff477..77ea34b03285 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1545,6 +1545,10 @@ enum ieee80211_ampdu_mlme_action {
  *      and need to call wiphy_rfkill_set_hw_state() in the callback.
  *
  * @testmode_cmd: Implement a cfg80211 test mode command.
+ *
+ * @flush: Flush all pending frames from the hardware queue, making sure
+ *      that the hardware queues are empty. If the parameter @drop is set
+ *      to %true, pending frames may be dropped.
  */
 struct ieee80211_ops {
         int (*tx)(struct ieee80211_hw *hw, struct sk_buff *skb);
@@ -1601,6 +1605,7 @@ struct ieee80211_ops {
 #ifdef CONFIG_NL80211_TESTMODE
         int (*testmode_cmd)(struct ieee80211_hw *hw, void *data, int len);
 #endif
+        void (*flush)(struct ieee80211_hw *hw, bool drop);
 };
 
 /**