openwrt-xburst/package/mac80211/patches/530-ath9k_queue_fill.patch

--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -137,6 +137,8 @@ void ath_descdma_cleanup(struct ath_soft
 #define ATH_MAX_ANTENNA         3
 #define ATH_RXBUF               512
 #define ATH_TXBUF               512
+#define ATH_TXBUF_RESERVE       5
+#define ATH_MAX_QDEPTH          (ATH_TXBUF / 4 - ATH_TXBUF_RESERVE)
 #define ATH_TXMAXTRY            13
 #define ATH_MGT_TXMAXTRY        4
 
@@ -205,6 +207,7 @@ struct ath_txq {
 	struct list_head txq_fifo_pending;
 	u8 txq_headidx;
 	u8 txq_tailidx;
+	int pending_frames;
 };
 
 struct ath_atx_ac {
@@ -242,6 +245,7 @@ struct ath_buf {
 	struct ath_buf_state bf_state;
 	dma_addr_t bf_dmacontext;
 	struct ath_wiphy *aphy;
+	struct ath_txq *txq;
 };
 
 struct ath_atx_tid {
@@ -331,7 +335,6 @@ void ath_tx_node_cleanup(struct ath_soft
 void ath_txq_schedule(struct ath_softc *sc, struct ath_txq *txq);
 int ath_tx_init(struct ath_softc *sc, int nbufs);
 void ath_tx_cleanup(struct ath_softc *sc);
-struct ath_txq *ath_test_get_txq(struct ath_softc *sc, struct sk_buff *skb);
 int ath_txq_update(struct ath_softc *sc, int qnum,
 		   struct ath9k_tx_queue_info *q);
 int ath_tx_start(struct ieee80211_hw *hw, struct sk_buff *skb,
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -986,32 +986,6 @@ int ath_tx_get_qnum(struct ath_softc *sc
 	return qnum;
 }
 
-struct ath_txq *ath_test_get_txq(struct ath_softc *sc, struct sk_buff *skb)
-{
-	struct ath_txq *txq = NULL;
-	u16 skb_queue = skb_get_queue_mapping(skb);
-	int qnum;
-
-	qnum = ath_get_hal_qnum(skb_queue, sc);
-	txq = &sc->tx.txq[qnum];
-
-	spin_lock_bh(&txq->axq_lock);
-
-	if (txq->axq_depth >= (ATH_TXBUF - 20)) {
-		ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_XMIT,
-			  "TX queue: %d is full, depth: %d\n",
-			  qnum, txq->axq_depth);
-		ath_mac80211_stop_queue(sc, skb_queue);
-		txq->stopped = 1;
-		spin_unlock_bh(&txq->axq_lock);
-		return NULL;
-	}
-
-	spin_unlock_bh(&txq->axq_lock);
-
-	return txq;
-}
-
 int ath_txq_update(struct ath_softc *sc, int qnum,
 		   struct ath9k_tx_queue_info *qinfo)
 {
@@ -1811,6 +1785,7 @@ int ath_tx_start(struct ieee80211_hw *hw
 	struct ath_wiphy *aphy = hw->priv;
 	struct ath_softc *sc = aphy->sc;
 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	struct ath_txq *txq = txctl->txq;
 	struct ath_buf *bf;
 	int r;
 
@@ -1820,10 +1795,16 @@ int ath_tx_start(struct ieee80211_hw *hw
 		return -1;
 	}
 
+	bf->txq = txctl->txq;
+	spin_lock_bh(&bf->txq->axq_lock);
+	if (++bf->txq->pending_frames > ATH_MAX_QDEPTH && !txq->stopped) {
+		ath_mac80211_stop_queue(sc, skb_get_queue_mapping(skb));
+		txq->stopped = 1;
+	}
+	spin_unlock_bh(&bf->txq->axq_lock);
+
 	r = ath_tx_setup_buffer(hw, bf, skb, txctl);
 	if (unlikely(r)) {
-		struct ath_txq *txq = txctl->txq;
-
 		ath_print(common, ATH_DBG_FATAL, "TX mem alloc failure\n");
 
 		/* upon ath_tx_processq() this TX queue will be resumed, we
@@ -1831,7 +1812,7 @@ int ath_tx_start(struct ieee80211_hw *hw
 		 * we will at least have to run TX completionon one buffer
 		 * on the queue */
 		spin_lock_bh(&txq->axq_lock);
-		if (sc->tx.txq[txq->axq_qnum].axq_depth > 1) {
+		if (!txq->stopped && txq->axq_depth > 1) {
 			ath_mac80211_stop_queue(sc, skb_get_queue_mapping(skb));
 			txq->stopped = 1;
 		}
@@ -1972,6 +1953,13 @@ static void ath_tx_complete_buf(struct a
 			tx_flags |= ATH_TX_XRETRY;
 	}
 
+	if (bf->txq) {
+		spin_lock_bh(&bf->txq->axq_lock);
+		bf->txq->pending_frames--;
+		spin_unlock_bh(&bf->txq->axq_lock);
+		bf->txq = NULL;
+	}
+
 	dma_unmap_single(sc->dev, bf->bf_dmacontext, skb->len, DMA_TO_DEVICE);
 	ath_tx_complete(sc, skb, bf->aphy, tx_flags);
 	ath_debug_stat_tx(sc, txq, bf, ts);
@@ -2060,8 +2048,7 @@ static void ath_wake_mac80211_queue(stru
 	int qnum;
 
 	spin_lock_bh(&txq->axq_lock);
-	if (txq->stopped &&
-	    sc->tx.txq[txq->axq_qnum].axq_depth <= (ATH_TXBUF - 20)) {
+	if (txq->stopped && txq->pending_frames < ATH_MAX_QDEPTH) {
 		qnum = ath_get_mac80211_qnum(txq->axq_qnum, sc);
 		if (qnum != -1) {
 			ath_mac80211_start_queue(sc, qnum);
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1026,6 +1026,7 @@ static int ath9k_tx(struct ieee80211_hw 
 	struct ath_tx_control txctl;
 	int padpos, padsize;
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+	int qnum;
 
 	if (aphy->state != ATH_WIPHY_ACTIVE && aphy->state != ATH_WIPHY_SCAN) {
 		ath_print(common, ATH_DBG_XMIT,
@@ -1098,11 +1099,8 @@ static int ath9k_tx(struct ieee80211_hw 
 		memmove(skb->data, skb->data + padsize, padpos);
 	}
 
-	/* Check if a tx queue is available */
-
-	txctl.txq = ath_test_get_txq(sc, skb);
-	if (!txctl.txq)
-		goto exit;
+	qnum = ath_get_hal_qnum(skb_get_queue_mapping(skb), sc);
+	txctl.txq = &sc->tx.txq[qnum];
 
 	ath_print(common, ATH_DBG_XMIT, "transmitting packet, skb: %p\n", skb);