From 156369faa3f49c4fa37cf1f5254b1f3903b23dfd Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Wed, 14 Dec 2011 22:08:04 +0100 Subject: [PATCH] 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 Signed-off-by: John W. Linville --- drivers/net/wireless/ath/ath9k/ath9k.h | 6 ++-- drivers/net/wireless/ath/ath9k/debug.c | 2 +- drivers/net/wireless/ath/ath9k/main.c | 2 +- drivers/net/wireless/ath/ath9k/xmit.c | 50 +++++++++++++++++++++------------- 4 files changed, 37 insertions(+), 23 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h index fa6c905..6beaff5 100644 --- 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..5cb8ccef 100644 --- 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 --- 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 --- 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); -- 2.7.4