mac80211: do not pass PS frames out of mac80211 again

In order to handle powersave frames properly we had needed
to pass these out to the device queues again, and introduce
the skb->requeue bit. This, however, also has unnecessary
overhead by needing to 'clean up' already tried frames, and
this clean-up code is also buggy when software encryption
is used.

Instead of sending the frames via the master netdev queue
again, simply put them into the pending queue. This also
fixes a problem where frames for that particular station
could be reordered when some were still on the software
queues and older ones are re-injected into the software
queue after them.

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

1 files changed, 46 insertions, 0 deletions

diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 22f63815fb36..66ce96a69f31 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -341,6 +341,52 @@ void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 }
 EXPORT_SYMBOL(ieee80211_stop_queue);
 
+void ieee80211_add_pending_skb(struct ieee80211_local *local,
+                               struct sk_buff *skb)
+{
+        struct ieee80211_hw *hw = &local->hw;
+        unsigned long flags;
+        int queue = skb_get_queue_mapping(skb);
+
+        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
+        __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
+        __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_PENDING);
+        skb_queue_tail(&local->pending[queue], skb);
+        __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
+        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
+}
+
+int ieee80211_add_pending_skbs(struct ieee80211_local *local,
+                               struct sk_buff_head *skbs)
+{
+        struct ieee80211_hw *hw = &local->hw;
+        struct sk_buff *skb;
+        unsigned long flags;
+        int queue, ret = 0, i;
+
+        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
+        for (i = 0; i < hw->queues; i++)
+                __ieee80211_stop_queue(hw, i,
+                        IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
+
+        while ((skb = skb_dequeue(skbs))) {
+                ret++;
+                queue = skb_get_queue_mapping(skb);
+                skb_queue_tail(&local->pending[queue], skb);
+        }
+
+        for (i = 0; i < hw->queues; i++) {
+                if (ret)
+                        __ieee80211_stop_queue(hw, i,
+                                IEEE80211_QUEUE_STOP_REASON_PENDING);
+                __ieee80211_wake_queue(hw, i,
+                        IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
+        }
+        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
+
+        return ret;
+}
+
 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
                                     enum queue_stop_reason reason)
 {