ath9k: reduce the number of unnecessary BAR tx packets

When processing A-MPDU tx status, only send a BAR for the failed packet
with the highest sequence number.

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

diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index fa6c905..6beaff5 100644 (file)
--- 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_softc *sc, struct ath_descdma *dd,
 /* 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 :                             \
@@ -252,9 +255,9 @@ 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;
@@ -276,7 +279,6 @@ struct ath_tx_control {
 };
 
 #define ATH_TX_ERROR        0x01
-#define ATH_TX_BAR          0x02
 
 /**
  * @txq_map:  Index is mac80211 queue number.  This is

diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c
index 6fb719d..5cb8cce 100644 (file)
--- 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, struct ath_buf *bf,
        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/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 7d92004..4475b0d 100644 (file)
--- 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_softc *sc, struct ieee80211_sta *sta,
        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 +

diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index a46b4e2..649a11e 100644 (file)
--- 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_softc *sc, struct sk_buff *skb,
                            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_info(struct sk_buff *skb)
        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_softc *sc, struct ath_atx_tid *tid)
        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_softc *sc, struct ath_atx_tid *tid)
                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_softc *sc, struct ath_atx_tid *tid)
        }
 
        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_softc *sc, struct ath_txq *txq,
                        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);
        }
 
@@ -373,7 +384,7 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
        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;
@@ -383,6 +394,7 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
        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;
@@ -408,8 +420,7 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
                        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;
                }
@@ -419,6 +430,7 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
        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.
@@ -485,8 +497,9 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
                                txpending = 1;
                        } else {
                                txfail = 1;
-                               sendbar = 1;
                                txfail_cnt++;
+                               bar_index = max_t(int, bar_index,
+                                       ATH_BA_INDEX(seq_first, seqno));
                        }
                }
 
@@ -515,7 +528,7 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
                        }
 
                        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)) {
@@ -535,8 +548,10 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
 
                                                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;
                                        }
 
@@ -554,6 +569,9 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
                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)
@@ -1441,7 +1459,7 @@ static void ath_drain_txq_list(struct ath_softc *sc, struct ath_txq *txq,
                        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);
        }
 }
@@ -1945,9 +1963,6 @@ static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
 
        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;
@@ -1991,16 +2006,13 @@ static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
 
 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;
 
@@ -2107,7 +2119,7 @@ static void ath_tx_process_buffer(struct ath_softc *sc, struct ath_txq *txq,
 
        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);