From a63754b5d58150b66868203ff5f60b4e5f06c26f Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Thu, 16 Dec 2010 23:55:12 +0000
Subject: [PATCH] ath9k: use the number of pending aggregates instead of the
 queue depth to determine when it is time to form the next A-MPDU

SVN-Revision: 24627
---
 .../patches/540-ath9k_aggr_depth_fix.patch    | 89 +++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 package/mac80211/patches/540-ath9k_aggr_depth_fix.patch

diff --git a/package/mac80211/patches/540-ath9k_aggr_depth_fix.patch b/package/mac80211/patches/540-ath9k_aggr_depth_fix.patch
new file mode 100644
index 0000000000..ad0f2e1e9b
--- /dev/null
+++ b/package/mac80211/patches/540-ath9k_aggr_depth_fix.patch
@@ -0,0 +1,89 @@
+--- a/drivers/net/wireless/ath/ath9k/xmit.c
++++ b/drivers/net/wireless/ath/ath9k/xmit.c
+@@ -838,7 +838,7 @@ static void ath_tx_sched_aggr(struct ath
+ 		ath_tx_txqaddbuf(sc, txq, &bf_q);
+ 		TX_STAT_INC(txq->axq_qnum, a_aggr);
+ 
+-	} while (txq->axq_depth < ATH_AGGR_MIN_QDEPTH &&
++	} while (txq->axq_ampdu_depth < ATH_AGGR_MIN_QDEPTH &&
+ 		 status != ATH_AGGR_BAW_CLOSED);
+ }
+ 
+@@ -999,6 +999,7 @@ struct ath_txq *ath_txq_setup(struct ath
+ 		INIT_LIST_HEAD(&txq->axq_acq);
+ 		spin_lock_init(&txq->axq_lock);
+ 		txq->axq_depth = 0;
++		txq->axq_ampdu_depth = 0;
+ 		txq->axq_tx_inprogress = false;
+ 		sc->tx.txqsetup |= 1<<qnum;
+ 
+@@ -1068,6 +1069,12 @@ int ath_cabq_update(struct ath_softc *sc
+ 	return 0;
+ }
+ 
++static bool bf_is_ampdu_not_probing(struct ath_buf *bf)
++{
++    struct ieee80211_tx_info *info = IEEE80211_SKB_CB(bf->bf_mpdu);
++    return bf_isampdu(bf) && !(info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE);
++}
++
+ /*
+  * Drain a given TX queue (could be Beacon or Data)
+  *
+@@ -1126,7 +1133,8 @@ void ath_draintxq(struct ath_softc *sc, 
+ 		}
+ 
+ 		txq->axq_depth--;
+-
++		if (bf_is_ampdu_not_probing(bf))
++			txq->axq_ampdu_depth--;
+ 		spin_unlock_bh(&txq->axq_lock);
+ 
+ 		if (bf_isampdu(bf))
+@@ -1316,6 +1324,8 @@ static void ath_tx_txqaddbuf(struct ath_
+ 		ath9k_hw_txstart(ah, txq->axq_qnum);
+ 	}
+ 	txq->axq_depth++;
++	if (bf_is_ampdu_not_probing(bf))
++		txq->axq_ampdu_depth++;
+ }
+ 
+ static void ath_tx_send_ampdu(struct ath_softc *sc, struct ath_atx_tid *tid,
+@@ -1336,7 +1346,7 @@ static void ath_tx_send_ampdu(struct ath
+ 	 */
+ 	if (!list_empty(&tid->buf_q) || tid->paused ||
+ 	    !BAW_WITHIN(tid->seq_start, tid->baw_size, fi->seqno) ||
+-	    txctl->txq->axq_depth >= ATH_AGGR_MIN_QDEPTH) {
++	    txctl->txq->axq_ampdu_depth >= ATH_AGGR_MIN_QDEPTH) {
+ 		/*
+ 		 * Add this frame to software queue for scheduling later
+ 		 * for aggregation.
+@@ -2040,6 +2050,9 @@ static void ath_tx_processq(struct ath_s
+ 		txq->axq_tx_inprogress = false;
+ 		if (bf_held)
+ 			list_del(&bf_held->list);
++
++		if (bf_is_ampdu_not_probing(bf))
++			txq->axq_ampdu_depth--;
+ 		spin_unlock_bh(&txq->axq_lock);
+ 
+ 		if (bf_held)
+@@ -2168,6 +2181,8 @@ void ath_tx_edma_tasklet(struct ath_soft
+ 		INCR(txq->txq_tailidx, ATH_TXFIFO_DEPTH);
+ 		txq->axq_depth--;
+ 		txq->axq_tx_inprogress = false;
++		if (bf_is_ampdu_not_probing(bf))
++			txq->axq_ampdu_depth--;
+ 		spin_unlock_bh(&txq->axq_lock);
+ 
+ 		txok = !(txs.ts_status & ATH9K_TXERR_MASK);
+--- a/drivers/net/wireless/ath/ath9k/ath9k.h
++++ b/drivers/net/wireless/ath/ath9k/ath9k.h
+@@ -187,6 +187,7 @@ struct ath_txq {
+ 	struct list_head axq_q;
+ 	spinlock_t axq_lock;
+ 	u32 axq_depth;
++	u32 axq_ampdu_depth;
+ 	bool stopped;
+ 	bool axq_tx_inprogress;
+ 	struct list_head axq_acq;
-- 
2.30.2