ath9k: add some code to control internal driver queue length limits

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@27890 3c298f89-4303-0410-b956-a3cf2f4a3e73

2 files changed, 457 insertions, 0 deletions

diff --git a/package/mac80211/patches/573-ath9k_aggr_queue_cleanup.patch b/package/mac80211/patches/573-ath9k_aggr_queue_cleanup.patch
new file mode 100644
index 0000000000..2bec9dc3a4
--- /dev/null
+++ b/package/mac80211/patches/573-ath9k_aggr_queue_cleanup.patch
@@ -0,0 +1,281 @@
+--- a/drivers/net/wireless/ath/ath9k/ath9k.h
++++ b/drivers/net/wireless/ath/ath9k/ath9k.h
+@@ -200,6 +200,7 @@ struct ath_atx_ac {
+ };
+ 
+ struct ath_frame_info {
++	struct ath_buf *bf;
+ 	int framelen;
+ 	u32 keyix;
+ 	enum ath9k_key_type keytype;
+@@ -230,7 +231,7 @@ struct ath_buf {
+ 
+ struct ath_atx_tid {
+ 	struct list_head list;
+-	struct list_head buf_q;
++	struct sk_buff_head buf_q;
+ 	struct ath_node *an;
+ 	struct ath_atx_ac *ac;
+ 	unsigned long tx_buf[BITS_TO_LONGS(ATH_TID_MAX_BUFS)];
+--- a/drivers/net/wireless/ath/ath9k/debug.c
++++ b/drivers/net/wireless/ath/ath9k/debug.c
+@@ -711,7 +711,7 @@ static ssize_t read_file_stations(struct
+ 					" tid: %p %s %s %i %p %p\n",
+ 					tid, tid->sched ? "sched" : "idle",
+ 					tid->paused ? "paused" : "running",
+-					list_empty(&tid->buf_q),
++					skb_queue_empty(&tid->buf_q),
+ 					tid->an, tid->ac);
+ 			if (len >= size)
+ 				goto done;
+--- a/drivers/net/wireless/ath/ath9k/xmit.c
++++ b/drivers/net/wireless/ath/ath9k/xmit.c
+@@ -128,7 +128,7 @@ static void ath_tx_resume_tid(struct ath
+ 	spin_lock_bh(&txq->axq_lock);
+ 	tid->paused = false;
+ 
+-	if (list_empty(&tid->buf_q))
++	if (skb_queue_empty(&tid->buf_q))
+ 		goto unlock;
+ 
+ 	ath_tx_queue_tid(txq, tid);
+@@ -148,6 +148,7 @@ static struct ath_frame_info *get_frame_
+ static void ath_tx_flush_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
+ {
+ 	struct ath_txq *txq = tid->ac->txq;
++	struct sk_buff *skb;
+ 	struct ath_buf *bf;
+ 	struct list_head bf_head;
+ 	struct ath_tx_status ts;
+@@ -158,12 +159,13 @@ static void ath_tx_flush_tid(struct ath_
+ 	memset(&ts, 0, sizeof(ts));
+ 	spin_lock_bh(&txq->axq_lock);
+ 
+-	while (!list_empty(&tid->buf_q)) {
+-		bf = list_first_entry(&tid->buf_q, struct ath_buf, list);
+-		list_move_tail(&bf->list, &bf_head);
++	while ((skb = __skb_dequeue(&tid->buf_q))) {
++		fi = get_frame_info(skb);
++		bf = fi->bf;
++
++		list_add_tail(&bf->list, &bf_head);
+ 
+ 		spin_unlock_bh(&txq->axq_lock);
+-		fi = get_frame_info(bf->bf_mpdu);
+ 		if (fi->retries) {
+ 			ath_tx_update_baw(sc, tid, fi->seqno);
+ 			ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0);
+@@ -218,6 +220,7 @@ static void ath_tid_drain(struct ath_sof
+ 			  struct ath_atx_tid *tid)
+ 
+ {
++	struct sk_buff *skb;
+ 	struct ath_buf *bf;
+ 	struct list_head bf_head;
+ 	struct ath_tx_status ts;
+@@ -226,14 +229,12 @@ static void ath_tid_drain(struct ath_sof
+ 	memset(&ts, 0, sizeof(ts));
+ 	INIT_LIST_HEAD(&bf_head);
+ 
+-	for (;;) {
+-		if (list_empty(&tid->buf_q))
+-			break;
++	while ((skb = __skb_dequeue(&tid->buf_q))) {
++		fi = get_frame_info(skb);
++		bf = fi->bf;
+ 
+-		bf = list_first_entry(&tid->buf_q, struct ath_buf, list);
+-		list_move_tail(&bf->list, &bf_head);
++		list_add_tail(&bf->list, &bf_head);
+ 
+-		fi = get_frame_info(bf->bf_mpdu);
+ 		if (fi->retries)
+ 			ath_tx_update_baw(sc, tid, fi->seqno);
+ 
+@@ -351,7 +352,8 @@ static void ath_tx_complete_aggr(struct 
+ 	struct ieee80211_tx_info *tx_info;
+ 	struct ath_atx_tid *tid = NULL;
+ 	struct ath_buf *bf_next, *bf_last = bf->bf_lastbf;
+-	struct list_head bf_head, bf_pending;
++	struct list_head bf_head;
++	struct sk_buff_head bf_pending;
+ 	u16 seq_st = 0, acked_cnt = 0, txfail_cnt = 0;
+ 	u32 ba[WME_BA_BMP_SIZE >> 5];
+ 	int isaggr, txfail, txpending, sendbar = 0, needreset = 0, nbad = 0;
+@@ -428,8 +430,7 @@ static void ath_tx_complete_aggr(struct 
+ 		}
+ 	}
+ 
+-	INIT_LIST_HEAD(&bf_pending);
+-	INIT_LIST_HEAD(&bf_head);
++	__skb_queue_head_init(&bf_pending);
+ 
+ 	ath_tx_count_frames(sc, bf, ts, txok, &nframes, &nbad);
+ 	while (bf) {
+@@ -474,10 +475,10 @@ static void ath_tx_complete_aggr(struct 
+ 		 * Make sure the last desc is reclaimed if it
+ 		 * not a holding desc.
+ 		 */
+-		if (!bf_last->bf_stale || bf_next != NULL)
++		INIT_LIST_HEAD(&bf_head);
++		if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) ||
++		    bf_next != NULL || !bf_last->bf_stale)
+ 			list_move_tail(&bf->list, &bf_head);
+-		else
+-			INIT_LIST_HEAD(&bf_head);
+ 
+ 		if (!txpending || (tid->state & AGGR_CLEANUP)) {
+ 			/*
+@@ -528,7 +529,7 @@ static void ath_tx_complete_aggr(struct 
+ 
+ 					ath9k_hw_cleartxdesc(sc->sc_ah,
+ 							     tbf->bf_desc);
+-					list_add_tail(&tbf->list, &bf_head);
++					fi->bf = tbf;
+ 				} else {
+ 					/*
+ 					 * Clear descriptor status words for
+@@ -543,21 +544,21 @@ static void ath_tx_complete_aggr(struct 
+ 			 * Put this buffer to the temporary pending
+ 			 * queue to retain ordering
+ 			 */
+-			list_splice_tail_init(&bf_head, &bf_pending);
++			__skb_queue_tail(&bf_pending, skb);
+ 		}
+ 
+ 		bf = bf_next;
+ 	}
+ 
+ 	/* prepend un-acked frames to the beginning of the pending frame queue */
+-	if (!list_empty(&bf_pending)) {
++	if (!skb_queue_empty(&bf_pending)) {
+ 		if (an->sleeping)
+ 			ieee80211_sta_set_tim(sta);
+ 
+ 		spin_lock_bh(&txq->axq_lock);
+ 		if (clear_filter)
+ 			tid->ac->clear_ps_filter = true;
+-		list_splice(&bf_pending, &tid->buf_q);
++		skb_queue_splice(&bf_pending, &tid->buf_q);
+ 		if (!an->sleeping)
+ 			ath_tx_queue_tid(txq, tid);
+ 		spin_unlock_bh(&txq->axq_lock);
+@@ -722,19 +723,22 @@ static enum ATH_AGGR_STATUS ath_tx_form_
+ 					     int *aggr_len)
+ {
+ #define PADBYTES(_len) ((4 - ((_len) % 4)) % 4)
+-	struct ath_buf *bf, *bf_first, *bf_prev = NULL;
++	struct ath_buf *bf, *bf_first = NULL, *bf_prev = NULL;
+ 	int rl = 0, nframes = 0, ndelim, prev_al = 0;
+ 	u16 aggr_limit = 0, al = 0, bpad = 0,
+ 		al_delta, h_baw = tid->baw_size / 2;
+ 	enum ATH_AGGR_STATUS status = ATH_AGGR_DONE;
+ 	struct ieee80211_tx_info *tx_info;
+ 	struct ath_frame_info *fi;
+-
+-	bf_first = list_first_entry(&tid->buf_q, struct ath_buf, list);
++	struct sk_buff *skb;
+ 
+ 	do {
+-		bf = list_first_entry(&tid->buf_q, struct ath_buf, list);
+-		fi = get_frame_info(bf->bf_mpdu);
++		skb = skb_peek(&tid->buf_q);
++		fi = get_frame_info(skb);
++		bf = fi->bf;
++
++		if (!bf_first)
++			bf_first = bf;
+ 
+ 		/* do not step over block-ack window */
+ 		if (!BAW_WITHIN(tid->seq_start, tid->baw_size, fi->seqno)) {
+@@ -785,7 +789,9 @@ static enum ATH_AGGR_STATUS ath_tx_form_
+ 		if (!fi->retries)
+ 			ath_tx_addto_baw(sc, tid, fi->seqno);
+ 		ath9k_hw_set11n_aggr_middle(sc->sc_ah, bf->bf_desc, ndelim);
+-		list_move_tail(&bf->list, bf_q);
++
++		__skb_unlink(skb, &tid->buf_q);
++		list_add_tail(&bf->list, bf_q);
+ 		if (bf_prev) {
+ 			bf_prev->bf_next = bf;
+ 			ath9k_hw_set_desc_link(sc->sc_ah, bf_prev->bf_desc,
+@@ -793,7 +799,7 @@ static enum ATH_AGGR_STATUS ath_tx_form_
+ 		}
+ 		bf_prev = bf;
+ 
+-	} while (!list_empty(&tid->buf_q));
++	} while (!skb_queue_empty(&tid->buf_q));
+ 
+ 	*aggr_len = al;
+ 
+@@ -811,7 +817,7 @@ static void ath_tx_sched_aggr(struct ath
+ 	int aggr_len;
+ 
+ 	do {
+-		if (list_empty(&tid->buf_q))
++		if (skb_queue_empty(&tid->buf_q))
+ 			return;
+ 
+ 		INIT_LIST_HEAD(&bf_q);
+@@ -933,7 +939,7 @@ bool ath_tx_aggr_sleep(struct ath_softc 
+ 
+ 		spin_lock_bh(&txq->axq_lock);
+ 
+-		if (!list_empty(&tid->buf_q))
++		if (!skb_queue_empty(&tid->buf_q))
+ 			buffered = true;
+ 
+ 		tid->sched = false;
+@@ -966,7 +972,7 @@ void ath_tx_aggr_wakeup(struct ath_softc
+ 		spin_lock_bh(&txq->axq_lock);
+ 		ac->clear_ps_filter = true;
+ 
+-		if (!list_empty(&tid->buf_q) && !tid->paused) {
++		if (!skb_queue_empty(&tid->buf_q) && !tid->paused) {
+ 			ath_tx_queue_tid(txq, tid);
+ 			ath_txq_schedule(sc, txq);
+ 		}
+@@ -1308,7 +1314,7 @@ void ath_txq_schedule(struct ath_softc *
+ 			 * add tid to round-robin queue if more frames
+ 			 * are pending for the tid
+ 			 */
+-			if (!list_empty(&tid->buf_q))
++			if (!skb_queue_empty(&tid->buf_q))
+ 				ath_tx_queue_tid(txq, tid);
+ 
+ 			if (tid == last_tid ||
+@@ -1414,7 +1420,7 @@ static void ath_tx_send_ampdu(struct ath
+ 	 * - seqno is not within block-ack window
+ 	 * - h/w queue depth exceeds low water mark
+ 	 */
+-	if (!list_empty(&tid->buf_q) || tid->paused ||
++	if (!skb_queue_empty(&tid->buf_q) || tid->paused ||
+ 	    !BAW_WITHIN(tid->seq_start, tid->baw_size, fi->seqno) ||
+ 	    txctl->txq->axq_ampdu_depth >= ATH_AGGR_MIN_QDEPTH) {
+ 		/*
+@@ -1422,7 +1428,7 @@ static void ath_tx_send_ampdu(struct ath
+ 		 * for aggregation.
+ 		 */
+ 		TX_STAT_INC(txctl->txq->axq_qnum, a_queued_sw);
+-		list_add_tail(&bf->list, &tid->buf_q);
++		__skb_queue_tail(&tid->buf_q, bf->bf_mpdu);
+ 		if (!txctl->an || !txctl->an->sleeping)
+ 			ath_tx_queue_tid(txctl->txq, tid);
+ 		return;
+@@ -1753,6 +1759,7 @@ static struct ath_buf *ath_tx_setup_buff
+ 			    bf->bf_buf_addr,
+ 			    txq->axq_qnum);
+ 
++	fi->bf = bf;
+ 
+ 	return bf;
+ }
+@@ -2364,7 +2371,7 @@ void ath_tx_node_init(struct ath_softc *
+ 		tid->sched     = false;
+ 		tid->paused    = false;
+ 		tid->state &= ~AGGR_CLEANUP;
+-		INIT_LIST_HEAD(&tid->buf_q);
++		__skb_queue_head_init(&tid->buf_q);
+ 		acno = TID_TO_WME_AC(tidno);
+ 		tid->ac = &an->ac[acno];
+ 		tid->state &= ~AGGR_ADDBA_COMPLETE;
diff --git a/package/mac80211/patches/574-ath9k_limit_qlen.patch b/package/mac80211/patches/574-ath9k_limit_qlen.patch
new file mode 100644
index 0000000000..77f1f5c8a2
--- /dev/null
+++ b/package/mac80211/patches/574-ath9k_limit_qlen.patch
@@ -0,0 +1,176 @@
+--- a/drivers/net/wireless/ath/ath9k/ath9k.h
++++ b/drivers/net/wireless/ath/ath9k/ath9k.h
+@@ -235,6 +235,7 @@ struct ath_atx_tid {
+ 	struct ath_node *an;
+ 	struct ath_atx_ac *ac;
+ 	unsigned long tx_buf[BITS_TO_LONGS(ATH_TID_MAX_BUFS)];
++	int buf_pending;
+ 	u16 seq_start;
+ 	u16 seq_next;
+ 	u16 baw_size;
+@@ -283,6 +284,9 @@ struct ath_tx_control {
+  *  (axq_qnum).
+  */
+ struct ath_tx {
++	u32 qlen_single;
++	u32 qlen_aggr;
++
+ 	u16 seq_no;
+ 	u32 txqsetup;
+ 	spinlock_t txbuflock;
+--- a/drivers/net/wireless/ath/ath9k/debug.c
++++ b/drivers/net/wireless/ath/ath9k/debug.c
+@@ -1250,6 +1250,10 @@ int ath9k_init_debug(struct ath_hw *ah)
+ 			    sc, &fops_wiphy);
+ 	debugfs_create_file("xmit", S_IRUSR, sc->debug.debugfs_phy, sc,
+ 			    &fops_xmit);
++	debugfs_create_u32("qlen_single", S_IRUSR | S_IWUSR,
++			   sc->debug.debugfs_phy, &sc->tx.qlen_single);
++	debugfs_create_u32("qlen_aggr", S_IRUSR | S_IWUSR,
++			   sc->debug.debugfs_phy, &sc->tx.qlen_aggr);
+ 	debugfs_create_file("stations", S_IRUSR, sc->debug.debugfs_phy, sc,
+ 			    &fops_stations);
+ 	debugfs_create_file("misc", S_IRUSR, sc->debug.debugfs_phy, sc,
+--- a/drivers/net/wireless/ath/ath9k/xmit.c
++++ b/drivers/net/wireless/ath/ath9k/xmit.c
+@@ -339,6 +339,14 @@ static void ath_tx_count_frames(struct a
+ 	}
+ }
+ 
++static struct ath_atx_tid *ath_get_tid(struct ath_node *an, struct sk_buff *skb)
++{
++	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
++	u8 tidno;
++
++	tidno = ieee80211_get_qos_ctl(hdr)[0] & IEEE80211_QOS_CTL_TID_MASK;
++	return ATH_AN_2_TID(an, tidno);
++}
+ 
+ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
+ 				 struct ath_buf *bf, struct list_head *bf_q,
+@@ -433,6 +441,8 @@ static void ath_tx_complete_aggr(struct 
+ 	__skb_queue_head_init(&bf_pending);
+ 
+ 	ath_tx_count_frames(sc, bf, ts, txok, &nframes, &nbad);
++	tid->buf_pending -= nframes;
++
+ 	while (bf) {
+ 		txfail = txpending = 0;
+ 		bf_next = bf->bf_next;
+@@ -790,6 +800,7 @@ static enum ATH_AGGR_STATUS ath_tx_form_
+ 			ath_tx_addto_baw(sc, tid, fi->seqno);
+ 		ath9k_hw_set11n_aggr_middle(sc->sc_ah, bf->bf_desc, ndelim);
+ 
++		tid->buf_pending++;
+ 		__skb_unlink(skb, &tid->buf_q);
+ 		list_add_tail(&bf->list, bf_q);
+ 		if (bf_prev) {
+@@ -1441,6 +1452,8 @@ static void ath_tx_send_ampdu(struct ath
+ 	if (!fi->retries)
+ 		ath_tx_addto_baw(sc, tid, fi->seqno);
+ 
++	tid->buf_pending++;
++
+ 	/* Queue to h/w without aggregation */
+ 	TX_STAT_INC(txctl->txq->axq_qnum, a_queued_hw);
+ 	bf->bf_lastbf = bf;
+@@ -1505,7 +1518,6 @@ static void setup_frame_info(struct ieee
+ 	struct ath_atx_tid *tid;
+ 	enum ath9k_key_type keytype;
+ 	u16 seqno = 0;
+-	u8 tidno;
+ 
+ 	keytype = ath9k_cmn_get_hw_crypto_keytype(skb);
+ 
+@@ -1516,13 +1528,11 @@ static void setup_frame_info(struct ieee
+ 	if (an && ieee80211_is_data_qos(hdr->frame_control) &&
+ 		conf_is_ht(&hw->conf) && (sc->sc_flags & SC_OP_TXAGGR)) {
+ 
+-		tidno = ieee80211_get_qos_ctl(hdr)[0] & IEEE80211_QOS_CTL_TID_MASK;
+-
+ 		/*
+ 		 * Override seqno set by upper layer with the one
+ 		 * in tx aggregation state.
+ 		 */
+-		tid = ATH_AN_2_TID(an, tidno);
++		tid = ath_get_tid(an, skb);
+ 		seqno = tid->seq_next;
+ 		hdr->seq_ctrl = cpu_to_le16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
+ 		INCR(tid->seq_next, IEEE80211_SEQ_MAX);
+@@ -1766,24 +1776,14 @@ static struct ath_buf *ath_tx_setup_buff
+ 
+ /* FIXME: tx power */
+ static void ath_tx_start_dma(struct ath_softc *sc, struct ath_buf *bf,
+-			     struct ath_tx_control *txctl)
++			     struct ath_tx_control *txctl,
++			     struct ath_atx_tid *tid)
+ {
+ 	struct sk_buff *skb = bf->bf_mpdu;
+ 	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+-	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+ 	struct list_head bf_head;
+-	struct ath_atx_tid *tid = NULL;
+-	u8 tidno;
+ 
+ 	spin_lock_bh(&txctl->txq->axq_lock);
+-	if ((sc->sc_flags & SC_OP_TXAGGR) && txctl->an &&
+-		ieee80211_is_data_qos(hdr->frame_control)) {
+-		tidno = ieee80211_get_qos_ctl(hdr)[0] &
+-			IEEE80211_QOS_CTL_TID_MASK;
+-		tid = ATH_AN_2_TID(txctl->an, tidno);
+-
+-		WARN_ON(tid->ac->txq != txctl->txq);
+-	}
+ 
+ 	if ((tx_info->flags & IEEE80211_TX_CTL_AMPDU) && tid) {
+ 		/*
+@@ -1824,6 +1824,7 @@ int ath_tx_start(struct ieee80211_hw *hw
+ 	struct ieee80211_vif *vif = info->control.vif;
+ 	struct ath_softc *sc = hw->priv;
+ 	struct ath_txq *txq = txctl->txq;
++	struct ath_atx_tid *tid = NULL;
+ 	struct ath_buf *bf;
+ 	int padpos, padsize;
+ 	int frmlen = skb->len + FCS_LEN;
+@@ -1857,6 +1858,7 @@ int ath_tx_start(struct ieee80211_hw *hw
+ 
+ 		skb_push(skb, padsize);
+ 		memmove(skb->data, skb->data + padsize, padpos);
++		hdr = (struct ieee80211_hdr *) skb->data;
+ 	}
+ 
+ 	if ((vif && vif->type != NL80211_IFTYPE_AP &&
+@@ -1866,6 +1868,24 @@ int ath_tx_start(struct ieee80211_hw *hw
+ 
+ 	setup_frame_info(hw, skb, frmlen);
+ 
++	if ((sc->sc_flags & SC_OP_TXAGGR) && txctl->an &&
++	    ieee80211_is_data_qos(hdr->frame_control)) {
++		tid = ath_get_tid(txctl->an, skb);
++
++		WARN_ON(tid->ac->txq != txq);
++	}
++
++	if ((info->flags & IEEE80211_TX_CTL_AMPDU) && tid) {
++		if (sc->tx.qlen_aggr > 0 && skb_queue_len(&tid->buf_q) +
++		    tid->buf_pending >= sc->tx.qlen_aggr)
++			return -ENOMEM;
++	} else {
++		if (sc->tx.qlen_single > 0 &&
++		    txq->axq_depth - txq->axq_ampdu_depth >=
++		      sc->tx.qlen_single)
++			return -ENOMEM;
++	}
++
+ 	/*
+ 	 * At this point, the vif, hw_key and sta pointers in the tx control
+ 	 * info are no longer valid (overwritten by the ath_frame_info data.
+@@ -1884,7 +1904,7 @@ int ath_tx_start(struct ieee80211_hw *hw
+ 	}
+ 	spin_unlock_bh(&txq->axq_lock);
+ 
+-	ath_tx_start_dma(sc, bf, txctl);
++	ath_tx_start_dma(sc, bf, txctl, tid);
+ 
+ 	return 0;
+ }