[PATCH 4.4 51/56] mac80211: pass RX aggregation window size to driver

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sara Sharon <sara.sharon@xxxxxxxxx>

commit fad471860c097844432c7cf5d3ae6a0a059c2bdc upstream.

Currently mac80211 does not inform the driver of the window
size when starting an RX aggregation session.
To enable managing the reorder buffer in the driver or hardware
the window size is needed.

Signed-off-by: Sara Sharon <sara.sharon@xxxxxxxxx>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Amit Pundir <amit.pundir@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 include/net/mac80211.h |    8 +++++---
 net/mac80211/agg-rx.c  |    2 +-
 2 files changed, 6 insertions(+), 4 deletions(-)

--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -3020,9 +3020,11 @@ enum ieee80211_reconfig_type {
  * 	ieee80211_ampdu_mlme_action. Starting sequence number (@ssn)
  * 	is the first frame we expect to perform the action on. Notice
  * 	that TX/RX_STOP can pass NULL for this parameter.
- *	The @buf_size parameter is only valid when the action is set to
- *	%IEEE80211_AMPDU_TX_OPERATIONAL and indicates the peer's reorder
- *	buffer size (number of subframes) for this session -- the driver
+ *	The @buf_size parameter is valid only when the action is set to
+ *	%IEEE80211_AMPDU_RX_START or %IEEE80211_AMPDU_TX_OPERATIONAL and
+ *	indicates the reorder buffer size (number of subframes) for this
+ *	session.
+ *	When the action is set to %IEEE80211_AMPDU_TX_OPERATIONAL the driver
  *	may neither send aggregates containing more subframes than this
  *	nor send aggregates in a way that lost frames would exceed the
  *	buffer size. If just limiting the aggregate size, this would be
--- a/net/mac80211/agg-rx.c
+++ b/net/mac80211/agg-rx.c
@@ -323,7 +323,7 @@ void __ieee80211_start_rx_ba_session(str
 		__skb_queue_head_init(&tid_agg_rx->reorder_buf[i]);
 
 	ret = drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_START,
-			       &sta->sta, tid, &start_seq_num, 0, false);
+			       &sta->sta, tid, &start_seq_num, buf_size, false);
 	ht_dbg(sta->sdata, "Rx A-MPDU request on %pM tid %d result %d\n",
 	       sta->sta.addr, tid, ret);
 	if (ret) {