ath9k: Fix rate control update for aggregated frames

We will miss rate control update if first A-MPDU of an
aggregation is not Block Acked as we always tell if the
rate control needs to updated through update_rc of first
A-MPDU. This patch does rate control update for the first
A-MPDU which notifies it's tx status (which is not
necessarily the first A-MPDU of an aggregation) to mac80211.

Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath9k/xmit.c b/drivers/net/wireless/ath9k/xmit.c
index 8968abe..f287719 100644 (file)
--- a/drivers/net/wireless/ath9k/xmit.c
+++ b/drivers/net/wireless/ath9k/xmit.c
@@ -64,6 +64,10 @@ static void ath_tx_complete_buf(struct ath_softc *sc, struct ath_buf *bf,
 static void ath_tx_txqaddbuf(struct ath_softc *sc, struct ath_txq *txq,
                             struct list_head *head);
 static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf);
+static int ath_tx_num_badfrms(struct ath_softc *sc, struct ath_buf *bf,
+                             int txok);
+static void ath_tx_rc_status(struct ath_buf *bf, struct ath_desc *ds,
+                            int nbad, int txok);
 
 /*********************/
 /* Aggregation logic */
@@ -274,9 +278,10 @@ 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 ath_desc *ds = bf_last->bf_desc;
        struct list_head bf_head, bf_pending;
-       u16 seq_st = 0;
+       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;
+       int isaggr, txfail, txpending, sendbar = 0, needreset = 0, nbad = 0;
+       bool rc_update = true;
 
        skb = (struct sk_buff *)bf->bf_mpdu;
        hdr = (struct ieee80211_hdr *)skb->data;
@@ -316,6 +321,7 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
        INIT_LIST_HEAD(&bf_pending);
        INIT_LIST_HEAD(&bf_head);
 
+       nbad = ath_tx_num_badfrms(sc, bf, txok);
        while (bf) {
                txfail = txpending = 0;
                bf_next = bf->bf_next;
@@ -323,8 +329,10 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
                if (ATH_BA_ISSET(ba, ATH_BA_INDEX(seq_st, bf->bf_seqno))) {
                        /* transmit completion, subframe is
                         * acked by block ack */
+                       acked_cnt++;
                } else if (!isaggr && txok) {
                        /* transmit completion */
+                       acked_cnt++;
                } else {
                        if (!(tid->state & AGGR_CLEANUP) &&
                            ds->ds_txstat.ts_flags != ATH9K_TX_SW_ABORTED) {
@@ -335,6 +343,7 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
                                        bf->bf_state.bf_type |= BUF_XRETRY;
                                        txfail = 1;
                                        sendbar = 1;
+                                       txfail_cnt++;
                                }
                        } else {
                                /*
@@ -361,6 +370,11 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
                        ath_tx_update_baw(sc, tid, bf->bf_seqno);
                        spin_unlock_bh(&txq->axq_lock);
 
+                       if (rc_update)
+                               if (acked_cnt == 1 || txfail_cnt == 1) {
+                                       ath_tx_rc_status(bf, ds, nbad, txok);
+                                       rc_update = false;
+                               }
                        ath_tx_complete_buf(sc, bf, &bf_head, !txfail, sendbar);
                } else {
                        /* retry the un-acked ones */
@@ -1901,7 +1915,7 @@ static void ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
        struct ath_buf *bf, *lastbf, *bf_held = NULL;
        struct list_head bf_head;
        struct ath_desc *ds;
-       int txok, nbad = 0;
+       int txok;
        int status;
 
        DPRINTF(sc, ATH_DBG_QUEUE, "tx queue %d (%x), link %p\n",
@@ -1995,13 +2009,9 @@ static void ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
                        bf->bf_retries = ds->ds_txstat.ts_longretry;
                        if (ds->ds_txstat.ts_status & ATH9K_TXERR_XRETRY)
                                bf->bf_state.bf_type |= BUF_XRETRY;
-                       nbad = 0;
-               } else {
-                       nbad = ath_tx_num_badfrms(sc, bf, txok);
+                       ath_tx_rc_status(bf, ds, 0, txok);
                }
 
-               ath_tx_rc_status(bf, ds, nbad, txok);
-
                if (bf_isampdu(bf))
                        ath_tx_complete_aggr(sc, txq, bf, &bf_head, txok);
                else