121 lines
3.6 KiB
Diff
121 lines
3.6 KiB
Diff
From: Felix Fietkau <nbd@openwrt.org>
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Date: Thu, 2 Jul 2015 15:20:56 +0200
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Subject: [PATCH] ath9k: limit retries for powersave response frames
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In some cases, the channel might be busy enough that an ath9k AP's
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response to PS-Poll frames might be too slow and the station has already
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gone to sleep. To avoid wasting too much airtime on this, limit the
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number of retries on such frames and ensure that no sample rate gets
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used.
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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
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---
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--- a/drivers/net/wireless/ath/ath9k/xmit.c
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+++ b/drivers/net/wireless/ath/ath9k/xmit.c
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@@ -147,10 +147,25 @@ static void ath_send_bar(struct ath_atx_
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}
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static void ath_set_rates(struct ieee80211_vif *vif, struct ieee80211_sta *sta,
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- struct ath_buf *bf)
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+ struct ath_buf *bf, bool ps)
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{
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+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(bf->bf_mpdu);
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+
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+ if (ps) {
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+ /* Clear the first rate to avoid using a sample rate for PS frames */
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+ info->control.rates[0].idx = -1;
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+ info->control.rates[0].count = 0;
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+ }
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+
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ieee80211_get_tx_rates(vif, sta, bf->bf_mpdu, bf->rates,
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ARRAY_SIZE(bf->rates));
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+ if (!ps)
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+ return;
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+
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+ if (bf->rates[0].count > 2)
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+ bf->rates[0].count = 2;
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+
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+ bf->rates[1].idx = -1;
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}
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static void ath_txq_skb_done(struct ath_softc *sc, struct ath_txq *txq,
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@@ -1430,7 +1445,7 @@ ath_tx_form_burst(struct ath_softc *sc,
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if (tx_info->flags & IEEE80211_TX_CTL_AMPDU)
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break;
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- ath_set_rates(tid->an->vif, tid->an->sta, bf);
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+ ath_set_rates(tid->an->vif, tid->an->sta, bf, false);
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} while (1);
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}
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@@ -1461,7 +1476,7 @@ static bool ath_tx_sched_aggr(struct ath
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return false;
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}
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- ath_set_rates(tid->an->vif, tid->an->sta, bf);
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+ ath_set_rates(tid->an->vif, tid->an->sta, bf, false);
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if (aggr)
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last = ath_tx_form_aggr(sc, txq, tid, &bf_q, bf,
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tid_q, &aggr_len);
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@@ -1653,7 +1668,7 @@ void ath9k_release_buffered_frames(struc
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__skb_unlink(bf->bf_mpdu, tid_q);
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list_add_tail(&bf->list, &bf_q);
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- ath_set_rates(tid->an->vif, tid->an->sta, bf);
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+ ath_set_rates(tid->an->vif, tid->an->sta, bf, true);
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if (bf_isampdu(bf)) {
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ath_tx_addto_baw(sc, tid, bf);
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bf->bf_state.bf_type &= ~BUF_AGGR;
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@@ -2318,7 +2333,7 @@ int ath_tx_start(struct ieee80211_hw *hw
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struct ath_txq *txq = txctl->txq;
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struct ath_atx_tid *tid = NULL;
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struct ath_buf *bf;
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- bool queue, skip_uapsd = false, ps_resp;
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+ bool queue, ps_resp;
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int q, ret;
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if (vif)
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@@ -2365,13 +2380,13 @@ int ath_tx_start(struct ieee80211_hw *hw
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if (!txctl->an)
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txctl->an = &avp->mcast_node;
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queue = true;
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- skip_uapsd = true;
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+ ps_resp = false;
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}
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if (txctl->an && queue)
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tid = ath_get_skb_tid(sc, txctl->an, skb);
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- if (!skip_uapsd && ps_resp) {
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+ if (ps_resp) {
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ath_txq_unlock(sc, txq);
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txq = sc->tx.uapsdq;
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ath_txq_lock(sc, txq);
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@@ -2409,7 +2424,7 @@ int ath_tx_start(struct ieee80211_hw *hw
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if (txctl->paprd)
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bf->bf_state.bfs_paprd_timestamp = jiffies;
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- ath_set_rates(vif, sta, bf);
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+ ath_set_rates(vif, sta, bf, ps_resp);
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ath_tx_send_normal(sc, txq, tid, skb);
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out:
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@@ -2448,7 +2463,7 @@ void ath_tx_cabq(struct ieee80211_hw *hw
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break;
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bf->bf_lastbf = bf;
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- ath_set_rates(vif, NULL, bf);
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+ ath_set_rates(vif, NULL, bf, false);
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ath_buf_set_rate(sc, bf, &info, fi->framelen, false);
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duration += info.rates[0].PktDuration;
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if (bf_tail)
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@@ -2968,7 +2983,7 @@ int ath9k_tx99_send(struct ath_softc *sc
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return -EINVAL;
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}
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- ath_set_rates(sc->tx99_vif, NULL, bf);
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+ ath_set_rates(sc->tx99_vif, NULL, bf, false);
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ath9k_hw_set_desc_link(sc->sc_ah, bf->bf_desc, bf->bf_daddr);
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ath9k_hw_tx99_start(sc->sc_ah, txctl->txq->axq_qnum);
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