ath9k: make per-WMM-AC queue sizes configurable via debugfs

Prepare for using different queue size defaults for each AC.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

4 files changed, 14 insertions, 2 deletions

diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 54f0c9d0049..db17ec4f0a8 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -297,6 +297,7 @@ struct ath_tx {
         struct ath_txq txq[ATH9K_NUM_TX_QUEUES];
         struct ath_descdma txdma;
         struct ath_txq *txq_map[WME_NUM_AC];
+        u32 txq_max_pending[WME_NUM_AC];
 };
 
 struct ath_rx_edma {
diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c
index 5c3192ffc19..b9ea067a7bb 100644
--- a/drivers/net/wireless/ath/ath9k/debug.c
+++ b/drivers/net/wireless/ath/ath9k/debug.c
@@ -1556,6 +1556,14 @@ int ath9k_init_debug(struct ath_hw *ah)
                             &fops_interrupt);
         debugfs_create_file("xmit", S_IRUSR, sc->debug.debugfs_phy, sc,
                             &fops_xmit);
+        debugfs_create_u32("qlen_bk", S_IRUSR | S_IWUSR, sc->debug.debugfs_phy,
+                           &sc->tx.txq_max_pending[WME_AC_BK]);
+        debugfs_create_u32("qlen_be", S_IRUSR | S_IWUSR, sc->debug.debugfs_phy,
+                           &sc->tx.txq_max_pending[WME_AC_BE]);
+        debugfs_create_u32("qlen_vi", S_IRUSR | S_IWUSR, sc->debug.debugfs_phy,
+                           &sc->tx.txq_max_pending[WME_AC_VI]);
+        debugfs_create_u32("qlen_vo", S_IRUSR | S_IWUSR, sc->debug.debugfs_phy,
+                           &sc->tx.txq_max_pending[WME_AC_VO]);
         debugfs_create_file("stations", S_IRUSR, sc->debug.debugfs_phy, sc,
                             &fops_stations);
         debugfs_create_file("misc", S_IRUSR, sc->debug.debugfs_phy, sc,
diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index af95d180d7f..181977a414e 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -434,6 +434,7 @@ static int ath9k_init_queues(struct ath_softc *sc)
         for (i = 0; i < WME_NUM_AC; i++) {
                 sc->tx.txq_map[i] = ath_txq_setup(sc, ATH9K_TX_QUEUE_DATA, i);
                 sc->tx.txq_map[i]->mac80211_qnum = i;
+                sc->tx.txq_max_pending[i] = ATH_MAX_QDEPTH;
         }
         return 0;
 }
diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index cafb4a09729..571d77362b6 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -1988,7 +1988,8 @@ int ath_tx_start(struct ieee80211_hw *hw, struct sk_buff *skb,
 
         ath_txq_lock(sc, txq);
         if (txq == sc->tx.txq_map[q] &&
-            ++txq->pending_frames > ATH_MAX_QDEPTH && !txq->stopped) {
+            ++txq->pending_frames > sc->tx.txq_max_pending[q] &&
+            !txq->stopped) {
                 ieee80211_stop_queue(sc->hw, q);
                 txq->stopped = true;
         }
@@ -2047,7 +2048,8 @@ static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
                 if (WARN_ON(--txq->pending_frames < 0))
                         txq->pending_frames = 0;
 
-                if (txq->stopped && txq->pending_frames < ATH_MAX_QDEPTH) {
+                if (txq->stopped &&
+                    txq->pending_frames < sc->tx.txq_max_pending[q]) {
                         ieee80211_wake_queue(sc->hw, q);
                         txq->stopped = false;
                 }