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ath9k: avoid retransmitting aggregation frames that a BAR was sent for 

The receiver will discard them anyway.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Felix Fietkau 2011-12-14 22:08:08 +01:00 committed by John W. Linville
parent 3ad2952998
commit f943754317
2 changed files with 25 additions and 3 deletions
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1
drivers/net/wireless/ath/ath9k/ath9k.h
View File

@ -241,6 +241,7 @@ 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 bar_index;
u16 seq_start;
u16 seq_next;
u16 baw_size;

27
drivers/net/wireless/ath/ath9k/xmit.c
View File

@ -206,6 +206,8 @@ static void ath_tx_update_baw(struct ath_softc *sc, struct ath_atx_tid *tid,
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_softc *sc, struct ath_txq *txq,
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,
@ -551,8 +554,12 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
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)) {
@ -779,8 +786,6 @@ static enum ATH_AGGR_STATUS ath_tx_form_aggr(struct ath_softc *sc,
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)) {
@ -788,6 +793,21 @@ static enum ATH_AGGR_STATUS ath_tx_form_aggr(struct ath_softc *sc,
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;
@ -1130,6 +1150,7 @@ int ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta,
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;