commit 412a6d800c7380c1b87c11080c7da905c27cfea8
author Sara Sharon <sara.sharon@intel.com> Tue Dec 08 19:09:05 2015 +0200
committer Johannes Berg <johannes.berg@intel.com> Wed Feb 24 09:04:16 2016 +0100
tree 6ebbfc270d12f9da48558c0d445fae32495c8c73
parent 50ea05efaf3bed7dd34bcc2635a8b3f53bd0ccc1

mac80211: support hw managing reorder logic

Enable driver to manage the reordering logic itself.
This is needed for example for the iwlwifi driver that
will support hardware assisted reordering.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/agg-rx.c

diff --git a/net/mac80211/agg-rx.c b/net/mac80211/agg-rx.c
index ec80db7..2ab5479 100644
--- a/net/mac80211/agg-rx.c
+++ b/net/mac80211/agg-rx.c
@@ -76,10 +76,11 @@
 	tid_rx = rcu_dereference_protected(sta->ampdu_mlme.tid_rx[tid],
 					lockdep_is_held(&sta->ampdu_mlme.mtx));
 
-	if (!tid_rx)
+	if (!test_bit(tid, sta->ampdu_mlme.agg_session_valid))
 		return;
 
 	RCU_INIT_POINTER(sta->ampdu_mlme.tid_rx[tid], NULL);
+	__clear_bit(tid, sta->ampdu_mlme.agg_session_valid);
 
 	ht_dbg(sta->sdata,
 	       "Rx BA session stop requested for %pM tid %u %s reason: %d\n",
@@ -97,6 +98,13 @@
 		ieee80211_send_delba(sta->sdata, sta->sta.addr,
 				     tid, WLAN_BACK_RECIPIENT, reason);
 
+	/*
+	 * return here in case tid_rx is not assigned - which will happen if
+	 * IEEE80211_HW_SUPPORTS_REORDERING_BUFFER is set.
+	 */
+	if (!tid_rx)
+		return;
+
 	del_timer_sync(&tid_rx->session_timer);
 
 	/* make sure ieee80211_sta_reorder_release() doesn't re-arm the timer */
@@ -297,7 +305,7 @@
 	/* examine state machine */
 	mutex_lock(&sta->ampdu_mlme.mtx);
 
-	if (sta->ampdu_mlme.tid_rx[tid]) {
+	if (test_bit(tid, sta->ampdu_mlme.agg_session_valid)) {
 		ht_dbg_ratelimited(sta->sdata,
 				   "unexpected AddBA Req from %pM on tid %u\n",
 				   sta->sta.addr, tid);
@@ -308,6 +316,16 @@
 						false);
 	}
 
+	if (ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER)) {
+		ret = drv_ampdu_action(local, sta->sdata, &params);
+		ht_dbg(sta->sdata,
+		       "Rx A-MPDU request on %pM tid %d result %d\n",
+		       sta->sta.addr, tid, ret);
+		if (!ret)
+			status = WLAN_STATUS_SUCCESS;
+		goto end;
+	}
+
 	/* prepare A-MPDU MLME for Rx aggregation */
 	tid_agg_rx = kmalloc(sizeof(struct tid_ampdu_rx), GFP_KERNEL);
 	if (!tid_agg_rx)
@@ -369,6 +387,8 @@
 	}
 
 end:
+	if (status == WLAN_STATUS_SUCCESS)
+		__set_bit(tid, sta->ampdu_mlme.agg_session_valid);
 	mutex_unlock(&sta->ampdu_mlme.mtx);
 
 end_no_lock: