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, 11 insertions, 0 deletions

diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index 718a5f198c30..4dee69a38c1d 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -896,6 +896,16 @@ static int mac80211_hwsim_ampdu_action(struct ieee80211_hw *hw,
         return 0;
 }
 
+static void mac80211_hwsim_flush(struct ieee80211_hw *hw, bool drop)
+{
+        /*
+         * In this special case, there's nothing we need to
+         * do because hwsim does transmission synchronously.
+         * In the future, when it does transmissions via
+         * userspace, we may need to do something.
+         */
+}
+
 
 static const struct ieee80211_ops mac80211_hwsim_ops =
 {
@@ -912,6 +922,7 @@ static const struct ieee80211_ops mac80211_hwsim_ops =
         .conf_tx = mac80211_hwsim_conf_tx,
         CFG80211_TESTMODE_CMD(mac80211_hwsim_testmode_cmd)
         .ampdu_action = mac80211_hwsim_ampdu_action,
+        .flush = mac80211_hwsim_flush,
 };