mac80211: Check for queued frames before entering power save.

In a highly noisy environment, the tx rate of the driver drops and
the application slows down since it has not yet received ACKs for
the frames already queued in the hardware. Since this ACK may take
more than 100ms, stopping the dev queues for entering PS at this
stage breaks applications, WMM test cases in my testing.
If there are frames already pending in the tx queue, postponing the
PS logic helps to avoid redundant queue stops. When power save is
enabled by default and in a noisy environment, this API certainly
helps in improving the average throughput.

Signed-off-by: Vivek Natarajan <vnatarajan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/net/mac80211/driver-trace.h b/net/mac80211/driver-trace.h
index 45aab80738e2..c8c934d48b7a 100644
--- a/net/mac80211/driver-trace.h
+++ b/net/mac80211/driver-trace.h
@@ -74,6 +74,21 @@ TRACE_EVENT(drv_return_int,
         TP_printk(LOCAL_PR_FMT " - %d", LOCAL_PR_ARG, __entry->ret)
 );
 
+TRACE_EVENT(drv_return_bool,
+        TP_PROTO(struct ieee80211_local *local, bool ret),
+        TP_ARGS(local, ret),
+        TP_STRUCT__entry(
+                LOCAL_ENTRY
+                __field(bool, ret)
+        ),
+        TP_fast_assign(
+                LOCAL_ASSIGN;
+                __entry->ret = ret;
+        ),
+        TP_printk(LOCAL_PR_FMT " - %s", LOCAL_PR_ARG, (__entry->ret) ?
+                  "true" : "false")
+);
+
 TRACE_EVENT(drv_return_u64,
         TP_PROTO(struct ieee80211_local *local, u64 ret),
         TP_ARGS(local, ret),
@@ -964,6 +979,11 @@ TRACE_EVENT(drv_get_ringparam,
         )
 );
 
+DEFINE_EVENT(local_only_evt, drv_tx_frames_pending,
+        TP_PROTO(struct ieee80211_local *local),
+        TP_ARGS(local)
+);
+
 DEFINE_EVENT(local_only_evt, drv_offchannel_tx_cancel_wait,
         TP_PROTO(struct ieee80211_local *local),
         TP_ARGS(local)