mac80211: add TX prepare API

Some drivers require setup before being able to send
management frames in managed mode, in particular in
multi-channel cases.

Introduce API to allow the drivers to do such setup
while being able to sleep waiting for the setup to
finish in the device. This isn't possible inside the
TX call since that can't sleep.

A future patch may also restructure the TX retry to
wait for the driver to report the frame status, as
suggested by Arik in
http://mid.gmane.org/CA+XVXffKSEL6ZQPQ98x-zO-NL2=TNF1uN==mprRyUmAaRn254g@mail.gmail.com

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 3f1b58cf9c8c..e3fa90ce9ecb 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -2244,6 +2244,18 @@ enum ieee80211_rate_control_changed {
  * @get_rssi: Get current signal strength in dBm, the function is optional
  *      and can sleep.
  *
+ * @mgd_prepare_tx: Prepare for transmitting a management frame for association
+ *      before associated. In multi-channel scenarios, a virtual interface is
+ *      bound to a channel before it is associated, but as it isn't associated
+ *      yet it need not necessarily be given airtime, in particular since any
+ *      transmission to a P2P GO needs to be synchronized against the GO's
+ *      powersave state. mac80211 will call this function before transmitting a
+ *      management frame prior to having successfully associated to allow the
+ *      driver to give it channel time for the transmission, to get a response
+ *      and to be able to synchronize with the GO.
+ *      The callback will be called before each transmission and upon return
+ *      mac80211 will transmit the frame right away.
+ *      The callback is optional and can (should!) sleep.
  */
 struct ieee80211_ops {
         void (*tx)(struct ieee80211_hw *hw, struct sk_buff *skb);
@@ -2383,6 +2395,9 @@ struct ieee80211_ops {
                                   u32 sset, u8 *data);
         int     (*get_rssi)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
                             struct ieee80211_sta *sta, s8 *rssi_dbm);
+
+        void    (*mgd_prepare_tx)(struct ieee80211_hw *hw,
+                                  struct ieee80211_vif *vif);
 };
 
 /**