From: nbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Date: Sat, 10 Dec 2011 21:17:07 +0000 (+0000)
Subject: ath9k: improve handling of blockackreq (should improve aggregation behavior under...
X-Git-Url: https://git.rohieb.name/openwrt.git/commitdiff_plain/60c148cc14e1cd983fb72022530bae59c93b2602
ath9k: improve handling of blockackreq (should improve aggregation behavior under tough wifi conditions with lots of retransmission)
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@29494 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
diff --git a/package/mac80211/patches/560-ath9k_rework_send_bar.patch b/package/mac80211/patches/560-ath9k_rework_send_bar.patch
new file mode 100644
index 000000000..9176713a5
--- /dev/null
+++ b/package/mac80211/patches/560-ath9k_rework_send_bar.patch
@@ -0,0 +1,240 @@
+--- a/drivers/net/wireless/ath/ath9k/ath9k.h
++++ b/drivers/net/wireless/ath/ath9k/ath9k.h
+@@ -159,6 +159,9 @@ void ath_descdma_cleanup(struct ath_soft
+ /* return block-ack bitmap index given sequence and starting sequence */
+ #define ATH_BA_INDEX(_st, _seq) (((_seq) - (_st)) & (IEEE80211_SEQ_MAX - 1))
+
++/* return the seqno for _start + _offset */
++#define ATH_BA_INDEX2SEQ(_seq, _offset) (((_seq) + (_offset)) & (IEEE80211_SEQ_MAX - 1))
++
+ /* returns delimiter padding required given the packet length */
+ #define ATH_AGGR_GET_NDELIM(_len) \
+ (((_len) >= ATH_AGGR_MINPLEN) ? 0 : \
+@@ -253,9 +256,9 @@ struct ath_atx_tid {
+ struct ath_node {
+ #ifdef CONFIG_ATH9K_DEBUGFS
+ struct list_head list; /* for sc->nodes */
++#endif
+ struct ieee80211_sta *sta; /* station struct we're part of */
+ struct ieee80211_vif *vif; /* interface with which we're associated */
+-#endif
+ struct ath_atx_tid tid[WME_NUM_TID];
+ struct ath_atx_ac ac[WME_NUM_AC];
+ int ps_key;
+@@ -277,7 +280,6 @@ struct ath_tx_control {
+ };
+
+ #define ATH_TX_ERROR 0x01
+-#define ATH_TX_BAR 0x02
+
+ /**
+ * @txq_map: Index is mac80211 queue number. This is
+--- a/drivers/net/wireless/ath/ath9k/main.c
++++ b/drivers/net/wireless/ath/ath9k/main.c
+@@ -644,9 +644,9 @@ static void ath_node_attach(struct ath_s
+ spin_lock(&sc->nodes_lock);
+ list_add(&an->list, &sc->nodes);
+ spin_unlock(&sc->nodes_lock);
++#endif
+ an->sta = sta;
+ an->vif = vif;
+-#endif
+ if (sc->sc_flags & SC_OP_TXAGGR) {
+ ath_tx_node_init(sc, an);
+ an->maxampdu = 1 << (IEEE80211_HT_MAX_AMPDU_FACTOR +
+--- a/drivers/net/wireless/ath/ath9k/xmit.c
++++ b/drivers/net/wireless/ath/ath9k/xmit.c
+@@ -53,7 +53,7 @@ static void ath_tx_complete(struct ath_s
+ int tx_flags, struct ath_txq *txq);
+ static void ath_tx_complete_buf(struct ath_softc *sc, struct ath_buf *bf,
+ struct ath_txq *txq, struct list_head *bf_q,
+- struct ath_tx_status *ts, int txok, int sendbar);
++ struct ath_tx_status *ts, int txok);
+ static void ath_tx_txqaddbuf(struct ath_softc *sc, struct ath_txq *txq,
+ struct list_head *head, bool internal);
+ static void ath_tx_rc_status(struct ath_softc *sc, struct ath_buf *bf,
+@@ -150,6 +150,12 @@ static struct ath_frame_info *get_frame_
+ return (struct ath_frame_info *) &tx_info->rate_driver_data[0];
+ }
+
++static void ath_send_bar(struct ath_atx_tid *tid, u16 seqno)
++{
++ ieee80211_send_bar(tid->an->vif, tid->an->sta->addr, tid->tidno,
++ seqno << IEEE80211_SEQ_SEQ_SHIFT);
++}
++
+ static void ath_tx_flush_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
+ {
+ struct ath_txq *txq = tid->ac->txq;
+@@ -158,6 +164,7 @@ static void ath_tx_flush_tid(struct ath_
+ struct list_head bf_head;
+ struct ath_tx_status ts;
+ struct ath_frame_info *fi;
++ bool sendbar = false;
+
+ INIT_LIST_HEAD(&bf_head);
+
+@@ -172,7 +179,8 @@ static void ath_tx_flush_tid(struct ath_
+ if (bf && fi->retries) {
+ list_add_tail(&bf->list, &bf_head);
+ ath_tx_update_baw(sc, tid, bf->bf_state.seqno);
+- ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0, 1);
++ ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0);
++ sendbar = true;
+ } else {
+ ath_tx_send_normal(sc, txq, NULL, skb);
+ }
+@@ -185,6 +193,9 @@ static void ath_tx_flush_tid(struct ath_
+ }
+
+ spin_unlock_bh(&txq->axq_lock);
++
++ if (sendbar)
++ ath_send_bar(tid, tid->seq_start);
+ }
+
+ static void ath_tx_update_baw(struct ath_softc *sc, struct ath_atx_tid *tid,
+@@ -255,7 +266,7 @@ static void ath_tid_drain(struct ath_sof
+ ath_tx_update_baw(sc, tid, bf->bf_state.seqno);
+
+ spin_unlock(&txq->axq_lock);
+- ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0, 0);
++ ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0);
+ spin_lock(&txq->axq_lock);
+ }
+
+@@ -381,7 +392,7 @@ static void ath_tx_complete_aggr(struct
+ struct ath_buf *bf_next, *bf_last = bf->bf_lastbf;
+ struct list_head bf_head;
+ struct sk_buff_head bf_pending;
+- u16 seq_st = 0, acked_cnt = 0, txfail_cnt = 0;
++ u16 seq_st = 0, acked_cnt = 0, txfail_cnt = 0, seq_first;
+ u32 ba[WME_BA_BMP_SIZE >> 5];
+ int isaggr, txfail, txpending, sendbar = 0, needreset = 0, nbad = 0;
+ bool rc_update = true;
+@@ -391,6 +402,7 @@ static void ath_tx_complete_aggr(struct
+ u8 tidno;
+ bool flush = !!(ts->ts_status & ATH9K_TX_FLUSH);
+ int i, retries;
++ int bar_index = -1;
+
+ skb = bf->bf_mpdu;
+ hdr = (struct ieee80211_hdr *)skb->data;
+@@ -416,8 +428,7 @@ static void ath_tx_complete_aggr(struct
+ if (!bf->bf_stale || bf_next != NULL)
+ list_move_tail(&bf->list, &bf_head);
+
+- ath_tx_complete_buf(sc, bf, txq, &bf_head, ts,
+- 0, 0);
++ ath_tx_complete_buf(sc, bf, txq, &bf_head, ts, 0);
+
+ bf = bf_next;
+ }
+@@ -427,6 +438,7 @@ static void ath_tx_complete_aggr(struct
+ an = (struct ath_node *)sta->drv_priv;
+ tidno = ieee80211_get_qos_ctl(hdr)[0] & IEEE80211_QOS_CTL_TID_MASK;
+ tid = ATH_AN_2_TID(an, tidno);
++ seq_first = tid->seq_start;
+
+ /*
+ * The hardware occasionally sends a tx status for the wrong TID.
+@@ -495,8 +507,9 @@ static void ath_tx_complete_aggr(struct
+ txpending = 1;
+ } else {
+ txfail = 1;
+- sendbar = 1;
+ txfail_cnt++;
++ bar_index = max_t(int, bar_index,
++ ATH_BA_INDEX(seq_first, seqno));
+ }
+ }
+
+@@ -525,7 +538,7 @@ static void ath_tx_complete_aggr(struct
+ }
+
+ ath_tx_complete_buf(sc, bf, txq, &bf_head, ts,
+- !txfail, sendbar);
++ !txfail);
+ } else {
+ /* retry the un-acked ones */
+ if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)) {
+@@ -545,8 +558,10 @@ static void ath_tx_complete_aggr(struct
+
+ ath_tx_complete_buf(sc, bf, txq,
+ &bf_head,
+- ts, 0,
+- !flush);
++ ts, 0);
++ bar_index = max_t(int, bar_index,
++ ATH_BA_INDEX(seq_first,
++ seqno));
+ break;
+ }
+
+@@ -564,6 +579,9 @@ static void ath_tx_complete_aggr(struct
+ bf = bf_next;
+ }
+
++ if (bar_index >= 0)
++ ath_send_bar(tid, ATH_BA_INDEX2SEQ(seq_first, bar_index + 1));
++
+ /* prepend un-acked frames to the beginning of the pending frame queue */
+ if (!skb_queue_empty(&bf_pending)) {
+ if (an->sleeping)
+@@ -1452,7 +1470,7 @@ static void ath_drain_txq_list(struct at
+ ath_tx_complete_aggr(sc, txq, bf, &bf_head, &ts, 0,
+ retry_tx);
+ else
+- ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0, 0);
++ ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0);
+ spin_lock_bh(&txq->axq_lock);
+ }
+ }
+@@ -1967,9 +1985,6 @@ static void ath_tx_complete(struct ath_s
+
+ ath_dbg(common, ATH_DBG_XMIT, "TX complete: skb: %p\n", skb);
+
+- if (tx_flags & ATH_TX_BAR)
+- tx_info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
+-
+ if (!(tx_flags & ATH_TX_ERROR))
+ /* Frame was ACKed */
+ tx_info->flags |= IEEE80211_TX_STAT_ACK;
+@@ -2013,16 +2028,13 @@ static void ath_tx_complete(struct ath_s
+
+ static void ath_tx_complete_buf(struct ath_softc *sc, struct ath_buf *bf,
+ struct ath_txq *txq, struct list_head *bf_q,
+- struct ath_tx_status *ts, int txok, int sendbar)
++ struct ath_tx_status *ts, int txok)
+ {
+ struct sk_buff *skb = bf->bf_mpdu;
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+ unsigned long flags;
+ int tx_flags = 0;
+
+- if (sendbar)
+- tx_flags = ATH_TX_BAR;
+-
+ if (!txok)
+ tx_flags |= ATH_TX_ERROR;
+
+@@ -2129,7 +2141,7 @@ static void ath_tx_process_buffer(struct
+
+ if (!bf_isampdu(bf)) {
+ ath_tx_rc_status(sc, bf, ts, 1, txok ? 0 : 1, txok);
+- ath_tx_complete_buf(sc, bf, txq, bf_head, ts, txok, 0);
++ ath_tx_complete_buf(sc, bf, txq, bf_head, ts, txok);
+ } else
+ ath_tx_complete_aggr(sc, txq, bf, bf_head, ts, txok, true);
+
+--- a/drivers/net/wireless/ath/ath9k/debug.c
++++ b/drivers/net/wireless/ath/ath9k/debug.c
+@@ -856,7 +856,7 @@ void ath_debug_stat_tx(struct ath_softc
+ sc->debug.stats.txstats[qnum].tx_bytes_all += bf->bf_mpdu->len;
+
+ if (bf_isampdu(bf)) {
+- if (flags & ATH_TX_BAR)
++ if (flags & ATH_TX_ERROR)
+ TX_STAT_INC(qnum, a_xretries);
+ else
+ TX_STAT_INC(qnum, a_completed);
diff --git a/package/mac80211/patches/561-ath9k_reduce_indentation.patch b/package/mac80211/patches/561-ath9k_reduce_indentation.patch
new file mode 100644
index 000000000..08ff157c6
--- /dev/null
+++ b/package/mac80211/patches/561-ath9k_reduce_indentation.patch
@@ -0,0 +1,159 @@
+--- a/drivers/net/wireless/ath/ath9k/xmit.c
++++ b/drivers/net/wireless/ath/ath9k/xmit.c
+@@ -490,27 +490,25 @@ static void ath_tx_complete_aggr(struct
+ } else if (!isaggr && txok) {
+ /* transmit completion */
+ acked_cnt++;
++ } else if ((tid->state & AGGR_CLEANUP) || !retry) {
++ /*
++ * cleanup in progress, just fail
++ * the un-acked sub-frames
++ */
++ txfail = 1;
++ } else if (flush) {
++ txpending = 1;
++ } else if (fi->retries < ATH_MAX_SW_RETRIES) {
++ if (txok || !an->sleeping)
++ ath_tx_set_retry(sc, txq, bf->bf_mpdu,
++ retries);
++
++ txpending = 1;
+ } else {
+- if ((tid->state & AGGR_CLEANUP) || !retry) {
+- /*
+- * cleanup in progress, just fail
+- * the un-acked sub-frames
+- */
+- txfail = 1;
+- } else if (flush) {
+- txpending = 1;
+- } else if (fi->retries < ATH_MAX_SW_RETRIES) {
+- if (txok || !an->sleeping)
+- ath_tx_set_retry(sc, txq, bf->bf_mpdu,
+- retries);
+-
+- txpending = 1;
+- } else {
+- txfail = 1;
+- txfail_cnt++;
+- bar_index = max_t(int, bar_index,
+- ATH_BA_INDEX(seq_first, seqno));
+- }
++ txfail = 1;
++ txfail_cnt++;
++ bar_index = max_t(int, bar_index,
++ ATH_BA_INDEX(seq_first, seqno));
+ }
+
+ /*
+@@ -541,32 +539,29 @@ static void ath_tx_complete_aggr(struct
+ !txfail);
+ } else {
+ /* retry the un-acked ones */
+- if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)) {
+- if (bf->bf_next == NULL && bf_last->bf_stale) {
+- struct ath_buf *tbf;
+-
+- tbf = ath_clone_txbuf(sc, bf_last);
+- /*
+- * Update tx baw and complete the
+- * frame with failed status if we
+- * run out of tx buf.
+- */
+- if (!tbf) {
+- spin_lock_bh(&txq->axq_lock);
+- ath_tx_update_baw(sc, tid, seqno);
+- spin_unlock_bh(&txq->axq_lock);
+-
+- ath_tx_complete_buf(sc, bf, txq,
+- &bf_head,
+- ts, 0);
+- bar_index = max_t(int, bar_index,
+- ATH_BA_INDEX(seq_first,
+- seqno));
+- break;
+- }
++ if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) &&
++ bf->bf_next == NULL && bf_last->bf_stale) {
++ struct ath_buf *tbf;
+
+- fi->bf = tbf;
++ tbf = ath_clone_txbuf(sc, bf_last);
++ /*
++ * Update tx baw and complete the
++ * frame with failed status if we
++ * run out of tx buf.
++ */
++ if (!tbf) {
++ spin_lock_bh(&txq->axq_lock);
++ ath_tx_update_baw(sc, tid, seqno);
++ spin_unlock_bh(&txq->axq_lock);
++
++ ath_tx_complete_buf(sc, bf, txq,
++ &bf_head, ts, 0);
++ bar_index = max_t(int, bar_index,
++ ATH_BA_INDEX(seq_first, seqno));
++ break;
+ }
++
++ fi->bf = tbf;
+ }
+
+ /*
+@@ -654,24 +649,26 @@ static u32 ath_lookup_rate(struct ath_so
+ max_4ms_framelen = ATH_AMPDU_LIMIT_MAX;
+
+ for (i = 0; i < 4; i++) {
+- if (rates[i].count) {
+- int modeidx;
+- if (!(rates[i].flags & IEEE80211_TX_RC_MCS)) {
+- legacy = 1;
+- break;
+- }
+-
+- if (rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
+- modeidx = MCS_HT40;
+- else
+- modeidx = MCS_HT20;
++ int modeidx;
+
+- if (rates[i].flags & IEEE80211_TX_RC_SHORT_GI)
+- modeidx++;
++ if (!rates[i].count)
++ continue;
+
+- frmlen = ath_max_4ms_framelen[modeidx][rates[i].idx];
+- max_4ms_framelen = min(max_4ms_framelen, frmlen);
++ if (!(rates[i].flags & IEEE80211_TX_RC_MCS)) {
++ legacy = 1;
++ break;
+ }
++
++ if (rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
++ modeidx = MCS_HT40;
++ else
++ modeidx = MCS_HT20;
++
++ if (rates[i].flags & IEEE80211_TX_RC_SHORT_GI)
++ modeidx++;
++
++ frmlen = ath_max_4ms_framelen[modeidx][rates[i].idx];
++ max_4ms_framelen = min(max_4ms_framelen, frmlen);
+ }
+
+ /*
+@@ -1598,11 +1595,9 @@ void ath_txq_schedule(struct ath_softc *
+ break;
+ }
+
+- if (!list_empty(&ac->tid_q)) {
+- if (!ac->sched) {
+- ac->sched = true;
+- list_add_tail(&ac->list, &txq->axq_acq);
+- }
++ if (!list_empty(&ac->tid_q) && !ac->sched) {
++ ac->sched = true;
++ list_add_tail(&ac->list, &txq->axq_acq);
+ }
+
+ if (ac == last_ac ||
diff --git a/package/mac80211/patches/562-ath9k_remove_seq_incr.patch b/package/mac80211/patches/562-ath9k_remove_seq_incr.patch
new file mode 100644
index 000000000..a89d0a50f
--- /dev/null
+++ b/package/mac80211/patches/562-ath9k_remove_seq_incr.patch
@@ -0,0 +1,13 @@
+--- a/drivers/net/wireless/ath/ath9k/xmit.c
++++ b/drivers/net/wireless/ath/ath9k/xmit.c
+@@ -1742,10 +1742,6 @@ static void ath_tx_send_normal(struct at
+ list_add_tail(&bf->list, &bf_head);
+ bf->bf_state.bf_type = 0;
+
+- /* update starting sequence number for subsequent ADDBA request */
+- if (tid)
+- INCR(tid->seq_start, IEEE80211_SEQ_MAX);
+-
+ bf->bf_lastbf = bf;
+ ath_tx_fill_desc(sc, bf, txq, fi->framelen);
+ ath_tx_txqaddbuf(sc, txq, &bf_head, false);
diff --git a/package/mac80211/patches/563-ath9k_simplify_tx_locking.patch b/package/mac80211/patches/563-ath9k_simplify_tx_locking.patch
new file mode 100644
index 000000000..c6b3ad231
--- /dev/null
+++ b/package/mac80211/patches/563-ath9k_simplify_tx_locking.patch
@@ -0,0 +1,247 @@
+--- a/drivers/net/wireless/ath/ath9k/xmit.c
++++ b/drivers/net/wireless/ath/ath9k/xmit.c
+@@ -169,13 +169,11 @@ static void ath_tx_flush_tid(struct ath_
+ INIT_LIST_HEAD(&bf_head);
+
+ memset(&ts, 0, sizeof(ts));
+- spin_lock_bh(&txq->axq_lock);
+
+ while ((skb = __skb_dequeue(&tid->buf_q))) {
+ fi = get_frame_info(skb);
+ bf = fi->bf;
+
+- spin_unlock_bh(&txq->axq_lock);
+ if (bf && fi->retries) {
+ list_add_tail(&bf->list, &bf_head);
+ ath_tx_update_baw(sc, tid, bf->bf_state.seqno);
+@@ -184,7 +182,6 @@ static void ath_tx_flush_tid(struct ath_
+ } else {
+ ath_tx_send_normal(sc, txq, NULL, skb);
+ }
+- spin_lock_bh(&txq->axq_lock);
+ }
+
+ if (tid->baw_head == tid->baw_tail) {
+@@ -192,8 +189,6 @@ static void ath_tx_flush_tid(struct ath_
+ tid->state &= ~AGGR_CLEANUP;
+ }
+
+- spin_unlock_bh(&txq->axq_lock);
+-
+ if (sendbar)
+ ath_send_bar(tid, tid->seq_start);
+ }
+@@ -254,9 +249,7 @@ static void ath_tid_drain(struct ath_sof
+ bf = fi->bf;
+
+ if (!bf) {
+- spin_unlock(&txq->axq_lock);
+ ath_tx_complete(sc, skb, ATH_TX_ERROR, txq);
+- spin_lock(&txq->axq_lock);
+ continue;
+ }
+
+@@ -265,9 +258,7 @@ static void ath_tid_drain(struct ath_sof
+ if (fi->retries)
+ ath_tx_update_baw(sc, tid, bf->bf_state.seqno);
+
+- spin_unlock(&txq->axq_lock);
+ ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0);
+- spin_lock(&txq->axq_lock);
+ }
+
+ tid->seq_next = tid->seq_start;
+@@ -525,9 +516,7 @@ static void ath_tx_complete_aggr(struct
+ * complete the acked-ones/xretried ones; update
+ * block-ack window
+ */
+- spin_lock_bh(&txq->axq_lock);
+ ath_tx_update_baw(sc, tid, seqno);
+- spin_unlock_bh(&txq->axq_lock);
+
+ if (rc_update && (acked_cnt == 1 || txfail_cnt == 1)) {
+ memcpy(tx_info->control.rates, rates, sizeof(rates));
+@@ -550,9 +539,7 @@ static void ath_tx_complete_aggr(struct
+ * run out of tx buf.
+ */
+ if (!tbf) {
+- spin_lock_bh(&txq->axq_lock);
+ ath_tx_update_baw(sc, tid, seqno);
+- spin_unlock_bh(&txq->axq_lock);
+
+ ath_tx_complete_buf(sc, bf, txq,
+ &bf_head, ts, 0);
+@@ -582,7 +569,6 @@ static void ath_tx_complete_aggr(struct
+ if (an->sleeping)
+ ieee80211_sta_set_buffered(sta, tid->tidno, true);
+
+- spin_lock_bh(&txq->axq_lock);
+ skb_queue_splice(&bf_pending, &tid->buf_q);
+ if (!an->sleeping) {
+ ath_tx_queue_tid(txq, tid);
+@@ -590,7 +576,6 @@ static void ath_tx_complete_aggr(struct
+ if (ts->ts_status & ATH9K_TXERR_FILT)
+ tid->ac->clear_ps_filter = true;
+ }
+- spin_unlock_bh(&txq->axq_lock);
+ }
+
+ if (tid->state & AGGR_CLEANUP)
+@@ -1190,9 +1175,9 @@ void ath_tx_aggr_stop(struct ath_softc *
+ txtid->state |= AGGR_CLEANUP;
+ else
+ txtid->state &= ~AGGR_ADDBA_COMPLETE;
+- spin_unlock_bh(&txq->axq_lock);
+
+ ath_tx_flush_tid(sc, txtid);
++ spin_unlock_bh(&txq->axq_lock);
+ }
+
+ void ath_tx_aggr_sleep(struct ieee80211_sta *sta, struct ath_softc *sc,
+@@ -1434,8 +1419,6 @@ static bool bf_is_ampdu_not_probing(stru
+
+ static void ath_drain_txq_list(struct ath_softc *sc, struct ath_txq *txq,
+ struct list_head *list, bool retry_tx)
+- __releases(txq->axq_lock)
+- __acquires(txq->axq_lock)
+ {
+ struct ath_buf *bf, *lastbf;
+ struct list_head bf_head;
+@@ -1462,13 +1445,11 @@ static void ath_drain_txq_list(struct at
+ if (bf_is_ampdu_not_probing(bf))
+ txq->axq_ampdu_depth--;
+
+- spin_unlock_bh(&txq->axq_lock);
+ if (bf_isampdu(bf))
+ ath_tx_complete_aggr(sc, txq, bf, &bf_head, &ts, 0,
+ retry_tx);
+ else
+ ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0);
+- spin_lock_bh(&txq->axq_lock);
+ }
+ }
+
+@@ -1847,8 +1828,6 @@ static void ath_tx_start_dma(struct ath_
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+ struct ath_buf *bf;
+
+- spin_lock_bh(&txctl->txq->axq_lock);
+-
+ if ((tx_info->flags & IEEE80211_TX_CTL_AMPDU) && tid) {
+ /*
+ * Try aggregation if it's a unicast data frame
+@@ -1858,7 +1837,7 @@ static void ath_tx_start_dma(struct ath_
+ } else {
+ bf = ath_tx_setup_buffer(sc, txctl->txq, tid, skb);
+ if (!bf)
+- goto out;
++ return;
+
+ bf->bf_state.bfs_paprd = txctl->paprd;
+
+@@ -1867,9 +1846,6 @@ static void ath_tx_start_dma(struct ath_
+
+ ath_tx_send_normal(sc, txctl->txq, tid, skb);
+ }
+-
+-out:
+- spin_unlock_bh(&txctl->txq->axq_lock);
+ }
+
+ /* Upon failure caller should free skb */
+@@ -1949,15 +1925,19 @@ int ath_tx_start(struct ieee80211_hw *hw
+ */
+
+ q = skb_get_queue_mapping(skb);
++
+ spin_lock_bh(&txq->axq_lock);
++
+ if (txq == sc->tx.txq_map[q] &&
+ ++txq->pending_frames > ATH_MAX_QDEPTH && !txq->stopped) {
+ ieee80211_stop_queue(sc->hw, q);
+ txq->stopped = 1;
+ }
+- spin_unlock_bh(&txq->axq_lock);
+
+ ath_tx_start_dma(sc, skb, txctl, tid);
++
++ spin_unlock_bh(&txq->axq_lock);
++
+ return 0;
+ }
+
+@@ -2003,7 +1983,6 @@ static void ath_tx_complete(struct ath_s
+
+ q = skb_get_queue_mapping(skb);
+ if (txq == sc->tx.txq_map[q]) {
+- spin_lock_bh(&txq->axq_lock);
+ if (WARN_ON(--txq->pending_frames < 0))
+ txq->pending_frames = 0;
+
+@@ -2011,7 +1990,6 @@ static void ath_tx_complete(struct ath_s
+ ieee80211_wake_queue(sc->hw, q);
+ txq->stopped = 0;
+ }
+- spin_unlock_bh(&txq->axq_lock);
+ }
+
+ ieee80211_tx_status(hw, skb);
+@@ -2117,8 +2095,6 @@ static void ath_tx_rc_status(struct ath_
+ static void ath_tx_process_buffer(struct ath_softc *sc, struct ath_txq *txq,
+ struct ath_tx_status *ts, struct ath_buf *bf,
+ struct list_head *bf_head)
+- __releases(txq->axq_lock)
+- __acquires(txq->axq_lock)
+ {
+ int txok;
+
+@@ -2128,16 +2104,12 @@ static void ath_tx_process_buffer(struct
+ if (bf_is_ampdu_not_probing(bf))
+ txq->axq_ampdu_depth--;
+
+- spin_unlock_bh(&txq->axq_lock);
+-
+ if (!bf_isampdu(bf)) {
+ ath_tx_rc_status(sc, bf, ts, 1, txok ? 0 : 1, txok);
+ ath_tx_complete_buf(sc, bf, txq, bf_head, ts, txok);
+ } else
+ ath_tx_complete_aggr(sc, txq, bf, bf_head, ts, txok, true);
+
+- spin_lock_bh(&txq->axq_lock);
+-
+ if (sc->sc_flags & SC_OP_TXAGGR)
+ ath_txq_schedule(sc, txq);
+ }
+@@ -2281,6 +2253,7 @@ void ath_tx_edma_tasklet(struct ath_soft
+ struct list_head bf_head;
+ int status;
+
++ spin_lock_bh(&txq->axq_lock);
+ for (;;) {
+ if (work_pending(&sc->hw_reset_work))
+ break;
+@@ -2300,12 +2273,8 @@ void ath_tx_edma_tasklet(struct ath_soft
+
+ txq = &sc->tx.txq[ts.qid];
+
+- spin_lock_bh(&txq->axq_lock);
+-
+- if (list_empty(&txq->txq_fifo[txq->txq_tailidx])) {
+- spin_unlock_bh(&txq->axq_lock);
+- return;
+- }
++ if (list_empty(&txq->txq_fifo[txq->txq_tailidx]))
++ break;
+
+ bf = list_first_entry(&txq->txq_fifo[txq->txq_tailidx],
+ struct ath_buf, list);
+@@ -2329,8 +2298,8 @@ void ath_tx_edma_tasklet(struct ath_soft
+ }
+
+ ath_tx_process_buffer(sc, txq, &ts, bf, &bf_head);
+- spin_unlock_bh(&txq->axq_lock);
+ }
++ spin_unlock_bh(&txq->axq_lock);
+ }
+
+ /*****************/
diff --git a/package/mac80211/patches/564-ath9k_track_last_bar.patch b/package/mac80211/patches/564-ath9k_track_last_bar.patch
new file mode 100644
index 000000000..34a4dd1dd
--- /dev/null
+++ b/package/mac80211/patches/564-ath9k_track_last_bar.patch
@@ -0,0 +1,82 @@
+--- a/drivers/net/wireless/ath/ath9k/ath9k.h
++++ b/drivers/net/wireless/ath/ath9k/ath9k.h
+@@ -242,6 +242,7 @@ struct ath_atx_tid {
+ struct ath_atx_ac *ac;
+ unsigned long tx_buf[BITS_TO_LONGS(ATH_TID_MAX_BUFS)];
+ int buf_pending;
++ int bar_index;
+ u16 seq_start;
+ u16 seq_next;
+ u16 baw_size;
+--- a/drivers/net/wireless/ath/ath9k/xmit.c
++++ b/drivers/net/wireless/ath/ath9k/xmit.c
+@@ -206,6 +206,8 @@ static void ath_tx_update_baw(struct ath
+ while (tid->baw_head != tid->baw_tail && !test_bit(tid->baw_head, tid->tx_buf)) {
+ INCR(tid->seq_start, IEEE80211_SEQ_MAX);
+ INCR(tid->baw_head, ATH_TID_MAX_BUFS);
++ if (tid->bar_index >= 0)
++ tid->bar_index--;
+ }
+ }
+
+@@ -263,6 +265,7 @@ static void ath_tid_drain(struct ath_sof
+
+ tid->seq_next = tid->seq_start;
+ tid->baw_tail = tid->baw_head;
++ tid->bar_index = -1;
+ }
+
+ static void ath_tx_set_retry(struct ath_softc *sc, struct ath_txq *txq,
+@@ -561,8 +564,12 @@ static void ath_tx_complete_aggr(struct
+ bf = bf_next;
+ }
+
+- if (bar_index >= 0)
++ if (bar_index >= 0) {
++ u16 bar_seq = ATH_BA_INDEX2SEQ(seq_first, bar_index);
+ ath_send_bar(tid, ATH_BA_INDEX2SEQ(seq_first, bar_index + 1));
++ if (BAW_WITHIN(tid->seq_start, tid->baw_size, bar_seq))
++ tid->bar_index = ATH_BA_INDEX(tid->seq_start, bar_seq);
++ }
+
+ /* prepend un-acked frames to the beginning of the pending frame queue */
+ if (!skb_queue_empty(&bf_pending)) {
+@@ -789,8 +796,6 @@ static enum ATH_AGGR_STATUS ath_tx_form_
+
+ bf->bf_state.bf_type = BUF_AMPDU | BUF_AGGR;
+ seqno = bf->bf_state.seqno;
+- if (!bf_first)
+- bf_first = bf;
+
+ /* do not step over block-ack window */
+ if (!BAW_WITHIN(tid->seq_start, tid->baw_size, seqno)) {
+@@ -798,6 +803,21 @@ static enum ATH_AGGR_STATUS ath_tx_form_
+ break;
+ }
+
++ if (tid->bar_index > ATH_BA_INDEX(tid->seq_start, seqno)) {
++ struct ath_tx_status ts = {};
++ struct list_head bf_head;
++
++ INIT_LIST_HEAD(&bf_head);
++ list_add(&bf->list, &bf_head);
++ __skb_unlink(skb, &tid->buf_q);
++ ath_tx_update_baw(sc, tid, seqno);
++ ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0);
++ continue;
++ }
++
++ if (!bf_first)
++ bf_first = bf;
++
+ if (!rl) {
+ aggr_limit = ath_lookup_rate(sc, bf, tid);
+ rl = 1;
+@@ -1141,6 +1161,7 @@ int ath_tx_aggr_start(struct ath_softc *
+ txtid->state |= AGGR_ADDBA_PROGRESS;
+ txtid->paused = true;
+ *ssn = txtid->seq_start = txtid->seq_next;
++ txtid->bar_index = -1;
+
+ memset(txtid->tx_buf, 0, sizeof(txtid->tx_buf));
+ txtid->baw_head = txtid->baw_tail = 0;