mac80211: sync driver before TX

In P2P client mode, the GO (AP) to connect to might
have periods of time where it is not available due
to powersave. To allow the driver to sync with it
and send frames to the GO only when it is available
add a new callback tx_sync (and the corresponding
finish_tx_sync). These callbacks can sleep unlike
the actual TX.

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

1 files changed, 43 insertions, 0 deletions

diff --git a/net/mac80211/driver-trace.h b/net/mac80211/driver-trace.h
index 4470f6e8b845..f47b00dc7afd 100644
--- a/net/mac80211/driver-trace.h
+++ b/net/mac80211/driver-trace.h
@@ -319,6 +319,49 @@ TRACE_EVENT(drv_bss_info_changed,
         )
 );
 
+DECLARE_EVENT_CLASS(tx_sync_evt,
+        TP_PROTO(struct ieee80211_local *local,
+                 struct ieee80211_sub_if_data *sdata,
+                 const u8 *bssid,
+                 enum ieee80211_tx_sync_type type),
+        TP_ARGS(local, sdata, bssid, type),
+
+        TP_STRUCT__entry(
+                LOCAL_ENTRY
+                VIF_ENTRY
+                __array(char, bssid, ETH_ALEN)
+                __field(u32, sync_type)
+        ),
+
+        TP_fast_assign(
+                LOCAL_ASSIGN;
+                VIF_ASSIGN;
+                memcpy(__entry->bssid, bssid, ETH_ALEN);
+                __entry->sync_type = type;
+        ),
+
+        TP_printk(
+                LOCAL_PR_FMT  VIF_PR_FMT " bssid:%pM type:%d",
+                LOCAL_PR_ARG, VIF_PR_ARG, __entry->bssid, __entry->sync_type
+        )
+);
+
+DEFINE_EVENT(tx_sync_evt, drv_tx_sync,
+        TP_PROTO(struct ieee80211_local *local,
+                 struct ieee80211_sub_if_data *sdata,
+                 const u8 *bssid,
+                 enum ieee80211_tx_sync_type type),
+        TP_ARGS(local, sdata, bssid, type)
+);
+
+DEFINE_EVENT(tx_sync_evt, drv_finish_tx_sync,
+        TP_PROTO(struct ieee80211_local *local,
+                 struct ieee80211_sub_if_data *sdata,
+                 const u8 *bssid,
+                 enum ieee80211_tx_sync_type type),
+        TP_ARGS(local, sdata, bssid, type)
+);
+
 TRACE_EVENT(drv_prepare_multicast,
         TP_PROTO(struct ieee80211_local *local, int mc_count),