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ath9k: fix queue stopping/starting logic, should slightly reduce RAM usage under load and make throughput more smooth
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@21650 3c298f89-4303-0410-b956-a3cf2f4a3e73
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nbd
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144
package/mac80211/patches/530-ath9k_queue_fill.patch
Normal file
144
package/mac80211/patches/530-ath9k_queue_fill.patch
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@ -0,0 +1,144 @@
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--- a/drivers/net/wireless/ath/ath9k/ath9k.h
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+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
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@@ -137,6 +137,8 @@ void ath_descdma_cleanup(struct ath_soft
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#define ATH_MAX_ANTENNA 3
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#define ATH_RXBUF 512
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#define ATH_TXBUF 512
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+#define ATH_TXBUF_RESERVE 5
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+#define ATH_MAX_QDEPTH (ATH_TXBUF / 4 - ATH_TXBUF_RESERVE)
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#define ATH_TXMAXTRY 13
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#define ATH_MGT_TXMAXTRY 4
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@@ -205,6 +207,7 @@ struct ath_txq {
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struct list_head txq_fifo_pending;
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u8 txq_headidx;
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u8 txq_tailidx;
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+ int pending_frames;
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};
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struct ath_atx_ac {
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@@ -242,6 +245,7 @@ struct ath_buf {
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struct ath_buf_state bf_state;
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dma_addr_t bf_dmacontext;
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struct ath_wiphy *aphy;
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+ struct ath_txq *txq;
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};
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struct ath_atx_tid {
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@@ -331,7 +335,6 @@ void ath_tx_node_cleanup(struct ath_soft
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void ath_txq_schedule(struct ath_softc *sc, struct ath_txq *txq);
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int ath_tx_init(struct ath_softc *sc, int nbufs);
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void ath_tx_cleanup(struct ath_softc *sc);
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-struct ath_txq *ath_test_get_txq(struct ath_softc *sc, struct sk_buff *skb);
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int ath_txq_update(struct ath_softc *sc, int qnum,
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struct ath9k_tx_queue_info *q);
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int ath_tx_start(struct ieee80211_hw *hw, struct sk_buff *skb,
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--- a/drivers/net/wireless/ath/ath9k/xmit.c
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+++ b/drivers/net/wireless/ath/ath9k/xmit.c
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@@ -986,32 +986,6 @@ int ath_tx_get_qnum(struct ath_softc *sc
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return qnum;
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}
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-struct ath_txq *ath_test_get_txq(struct ath_softc *sc, struct sk_buff *skb)
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-{
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- struct ath_txq *txq = NULL;
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- u16 skb_queue = skb_get_queue_mapping(skb);
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- int qnum;
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-
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- qnum = ath_get_hal_qnum(skb_queue, sc);
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- txq = &sc->tx.txq[qnum];
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-
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- spin_lock_bh(&txq->axq_lock);
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-
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- if (txq->axq_depth >= (ATH_TXBUF - 20)) {
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- ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_XMIT,
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- "TX queue: %d is full, depth: %d\n",
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- qnum, txq->axq_depth);
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- ath_mac80211_stop_queue(sc, skb_queue);
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- txq->stopped = 1;
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- spin_unlock_bh(&txq->axq_lock);
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- return NULL;
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- }
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-
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- spin_unlock_bh(&txq->axq_lock);
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-
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- return txq;
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-}
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-
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int ath_txq_update(struct ath_softc *sc, int qnum,
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struct ath9k_tx_queue_info *qinfo)
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{
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@@ -1811,6 +1785,7 @@ int ath_tx_start(struct ieee80211_hw *hw
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struct ath_wiphy *aphy = hw->priv;
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struct ath_softc *sc = aphy->sc;
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struct ath_common *common = ath9k_hw_common(sc->sc_ah);
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+ struct ath_txq *txq = txctl->txq;
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struct ath_buf *bf;
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int r;
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@@ -1820,10 +1795,16 @@ int ath_tx_start(struct ieee80211_hw *hw
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return -1;
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}
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+ bf->txq = txctl->txq;
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+ spin_lock_bh(&bf->txq->axq_lock);
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+ if (++bf->txq->pending_frames > ATH_MAX_QDEPTH && !txq->stopped) {
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+ ath_mac80211_stop_queue(sc, skb_get_queue_mapping(skb));
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+ txq->stopped = 1;
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+ }
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+ spin_unlock_bh(&bf->txq->axq_lock);
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+
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r = ath_tx_setup_buffer(hw, bf, skb, txctl);
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if (unlikely(r)) {
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- struct ath_txq *txq = txctl->txq;
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-
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ath_print(common, ATH_DBG_FATAL, "TX mem alloc failure\n");
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/* upon ath_tx_processq() this TX queue will be resumed, we
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@@ -1831,7 +1812,7 @@ int ath_tx_start(struct ieee80211_hw *hw
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* we will at least have to run TX completionon one buffer
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* on the queue */
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spin_lock_bh(&txq->axq_lock);
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- if (sc->tx.txq[txq->axq_qnum].axq_depth > 1) {
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+ if (!txq->stopped && txq->axq_depth > 1) {
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ath_mac80211_stop_queue(sc, skb_get_queue_mapping(skb));
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txq->stopped = 1;
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}
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@@ -1972,6 +1953,13 @@ static void ath_tx_complete_buf(struct a
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tx_flags |= ATH_TX_XRETRY;
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}
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+ if (bf->txq) {
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+ spin_lock_bh(&bf->txq->axq_lock);
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+ bf->txq->pending_frames--;
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+ spin_unlock_bh(&bf->txq->axq_lock);
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+ bf->txq = NULL;
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+ }
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+
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dma_unmap_single(sc->dev, bf->bf_dmacontext, skb->len, DMA_TO_DEVICE);
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ath_tx_complete(sc, skb, bf->aphy, tx_flags);
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ath_debug_stat_tx(sc, txq, bf, ts);
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--- a/drivers/net/wireless/ath/ath9k/main.c
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+++ b/drivers/net/wireless/ath/ath9k/main.c
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@@ -1026,6 +1026,7 @@ static int ath9k_tx(struct ieee80211_hw
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struct ath_tx_control txctl;
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int padpos, padsize;
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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+ int qnum;
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if (aphy->state != ATH_WIPHY_ACTIVE && aphy->state != ATH_WIPHY_SCAN) {
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ath_print(common, ATH_DBG_XMIT,
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@@ -1098,11 +1099,8 @@ static int ath9k_tx(struct ieee80211_hw
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memmove(skb->data, skb->data + padsize, padpos);
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}
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- /* Check if a tx queue is available */
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-
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- txctl.txq = ath_test_get_txq(sc, skb);
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- if (!txctl.txq)
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- goto exit;
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+ qnum = ath_get_hal_qnum(skb_get_queue_mapping(skb), sc);
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+ txctl.txq = &sc->tx.txq[qnum];
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ath_print(common, ATH_DBG_XMIT, "transmitting packet, skb: %p\n", skb);
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