ath9k: optimize waking tx queues, slightly improves performance under load

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@30918 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/mac80211/patches/565-ath9k_optimize_queue_wake.patch b/package/mac80211/patches/565-ath9k_optimize_queue_wake.patch
new file mode 100644 (file)
index 0000000..e04ffaa
--- /dev/null
+++ b/package/mac80211/patches/565-ath9k_optimize_queue_wake.patch
@@ -0,0 +1,39 @@
+--- a/drivers/net/wireless/ath/ath9k/xmit.c
++++ b/drivers/net/wireless/ath/ath9k/xmit.c
+@@ -121,13 +121,24 @@ static void ath_txq_unlock_complete(stru
+ {
+       struct sk_buff_head q;
+       struct sk_buff *skb;
++      int qnum = txq->mac80211_qnum;
++      bool wake = false;
+ 
+       __skb_queue_head_init(&q);
+       skb_queue_splice_init(&txq->complete_q, &q);
++
++      if (txq->stopped && txq->pending_frames < ATH_MAX_QDEPTH) {
++              txq->stopped = false;
++              wake = true;
++      }
++
+       spin_unlock_bh(&txq->axq_lock);
+ 
+       while ((skb = __skb_dequeue(&q)))
+               ieee80211_tx_status(sc->hw, skb);
++
++      if (wake)
++              ieee80211_wake_queue(sc->hw, qnum);
+ }
+ 
+ static void ath_tx_queue_tid(struct ath_txq *txq, struct ath_atx_tid *tid)
+@@ -2037,11 +2048,6 @@ static void ath_tx_complete(struct ath_s
+       if (txq == sc->tx.txq_map[q]) {
+               if (WARN_ON(--txq->pending_frames < 0))
+                       txq->pending_frames = 0;
+-
+-              if (txq->stopped && txq->pending_frames < ATH_MAX_QDEPTH) {
+-                      ieee80211_wake_queue(sc->hw, q);
+-                      txq->stopped = false;
+-              }
+       }
+ 
+       __skb_queue_tail(&txq->complete_q, skb);