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openwrt/package/kernel/mac80211/patches/335-ath9k-use-ieee80211_tx_status_noskb-where-possible.patch
Felix Fietkau 4701fd3190 ath9k: improve performance in tx status handling 
Signed-off-by: Felix Fietkau <nbd@nbd.name>
2016-08-04 23:10:41 +02:00

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From: Felix Fietkau <nbd@nbd.name>
Date: Tue, 2 Aug 2016 12:12:18 +0200
Subject: [PATCH] ath9k: use ieee80211_tx_status_noskb where possible
It removes the need for undoing the padding changes to skb->data and it
improves performance by eliminating one tx status lookup per MPDU in the
status path. It is also useful for preparing a follow-up fix to better
handle powersave filtering.
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -50,9 +50,11 @@ static u16 bits_per_symbol[][2] = {
static void ath_tx_send_normal(struct ath_softc *sc, struct ath_txq *txq,
struct ath_atx_tid *tid, struct sk_buff *skb);
static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
- int tx_flags, struct ath_txq *txq);
+ int tx_flags, struct ath_txq *txq,
+ struct ieee80211_sta *sta);
static void ath_tx_complete_buf(struct ath_softc *sc, struct ath_buf *bf,
struct ath_txq *txq, struct list_head *bf_q,
+ struct ieee80211_sta *sta,
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);
@@ -77,6 +79,22 @@ enum {
/* Aggregation logic */
/*********************/
+static void ath_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
+{
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ struct ieee80211_sta *sta = info->status.status_driver_data[0];
+
+ if (info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS) {
+ ieee80211_tx_status(hw, skb);
+ return;
+ }
+
+ if (sta)
+ ieee80211_tx_status_noskb(hw, sta, info);
+
+ dev_kfree_skb(skb);
+}
+
void ath_txq_lock(struct ath_softc *sc, struct ath_txq *txq)
__acquires(&txq->axq_lock)
{
@@ -92,6 +110,7 @@ void ath_txq_unlock(struct ath_softc *sc
void ath_txq_unlock_complete(struct ath_softc *sc, struct ath_txq *txq)
__releases(&txq->axq_lock)
{
+ struct ieee80211_hw *hw = sc->hw;
struct sk_buff_head q;
struct sk_buff *skb;
@@ -100,7 +119,7 @@ void ath_txq_unlock_complete(struct ath_
spin_unlock_bh(&txq->axq_lock);
while ((skb = __skb_dequeue(&q)))
- ieee80211_tx_status(sc->hw, skb);
+ ath_tx_status(hw, skb);
}
static void ath_tx_queue_tid(struct ath_softc *sc, struct ath_txq *txq,
@@ -268,7 +287,7 @@ static void ath_tx_flush_tid(struct ath_
}
list_add_tail(&bf->list, &bf_head);
- ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0);
+ ath_tx_complete_buf(sc, bf, txq, &bf_head, NULL, &ts, 0);
}
if (sendbar) {
@@ -333,12 +352,12 @@ static void ath_tid_drain(struct ath_sof
bf = fi->bf;
if (!bf) {
- ath_tx_complete(sc, skb, ATH_TX_ERROR, txq);
+ ath_tx_complete(sc, skb, ATH_TX_ERROR, txq, NULL);
continue;
}
list_add_tail(&bf->list, &bf_head);
- ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0);
+ ath_tx_complete_buf(sc, bf, txq, &bf_head, NULL, &ts, 0);
}
}
@@ -441,12 +460,11 @@ static void ath_tx_count_frames(struct a
static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
struct ath_buf *bf, struct list_head *bf_q,
+ struct ieee80211_sta *sta,
struct ath_tx_status *ts, int txok)
{
struct ath_node *an = NULL;
struct sk_buff *skb;
- struct ieee80211_sta *sta;
- struct ieee80211_hw *hw = sc->hw;
struct ieee80211_hdr *hdr;
struct ieee80211_tx_info *tx_info;
struct ath_atx_tid *tid = NULL;
@@ -475,12 +493,7 @@ static void ath_tx_complete_aggr(struct
for (i = 0; i < ts->ts_rateindex; i++)
retries += rates[i].count;
- rcu_read_lock();
-
- sta = ieee80211_find_sta_by_ifaddr(hw, hdr->addr1, hdr->addr2);
if (!sta) {
- rcu_read_unlock();
-
INIT_LIST_HEAD(&bf_head);
while (bf) {
bf_next = bf->bf_next;
@@ -488,7 +501,7 @@ static void ath_tx_complete_aggr(struct
if (!bf->bf_state.stale || bf_next != NULL)
list_move_tail(&bf->list, &bf_head);
- ath_tx_complete_buf(sc, bf, txq, &bf_head, ts, 0);
+ ath_tx_complete_buf(sc, bf, txq, &bf_head, NULL, ts, 0);
bf = bf_next;
}
@@ -598,7 +611,7 @@ static void ath_tx_complete_aggr(struct
ts);
}
- ath_tx_complete_buf(sc, bf, txq, &bf_head, ts,
+ ath_tx_complete_buf(sc, bf, txq, &bf_head, sta, ts,
!txfail);
} else {
if (tx_info->flags & IEEE80211_TX_STATUS_EOSP) {
@@ -619,7 +632,8 @@ static void ath_tx_complete_aggr(struct
ath_tx_update_baw(sc, tid, seqno);
ath_tx_complete_buf(sc, bf, txq,
- &bf_head, ts, 0);
+ &bf_head, NULL, ts,
+ 0);
bar_index = max_t(int, bar_index,
ATH_BA_INDEX(seq_first, seqno));
break;
@@ -663,8 +677,6 @@ static void ath_tx_complete_aggr(struct
ath_txq_lock(sc, txq);
}
- rcu_read_unlock();
-
if (needreset)
ath9k_queue_reset(sc, RESET_TYPE_TX_ERROR);
}
@@ -679,7 +691,10 @@ static void ath_tx_process_buffer(struct
struct ath_tx_status *ts, struct ath_buf *bf,
struct list_head *bf_head)
{
+ struct ieee80211_hw *hw = sc->hw;
struct ieee80211_tx_info *info;
+ struct ieee80211_sta *sta;
+ struct ieee80211_hdr *hdr;
bool txok, flush;
txok = !(ts->ts_status & ATH9K_TXERR_MASK);
@@ -692,6 +707,10 @@ static void ath_tx_process_buffer(struct
ts->duration = ath9k_hw_get_duration(sc->sc_ah, bf->bf_desc,
ts->ts_rateindex);
+
+ hdr = (struct ieee80211_hdr *) bf->bf_mpdu->data;
+ sta = ieee80211_find_sta_by_ifaddr(hw, hdr->addr1, hdr->addr2);
+
if (!bf_isampdu(bf)) {
if (!flush) {
info = IEEE80211_SKB_CB(bf->bf_mpdu);
@@ -700,9 +719,9 @@ static void ath_tx_process_buffer(struct
ath_tx_rc_status(sc, bf, ts, 1, txok ? 0 : 1, txok);
ath_dynack_sample_tx_ts(sc->sc_ah, bf->bf_mpdu, ts);
}
- ath_tx_complete_buf(sc, bf, txq, bf_head, ts, txok);
+ ath_tx_complete_buf(sc, bf, txq, bf_head, sta, ts, txok);
} else
- ath_tx_complete_aggr(sc, txq, bf, bf_head, ts, txok);
+ ath_tx_complete_aggr(sc, txq, bf, bf_head, sta, ts, txok);
if (!flush)
ath_txq_schedule(sc, txq);
@@ -938,7 +957,7 @@ ath_tx_get_tid_subframe(struct ath_softc
list_add(&bf->list, &bf_head);
__skb_unlink(skb, *q);
ath_tx_update_baw(sc, tid, seqno);
- ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0);
+ ath_tx_complete_buf(sc, bf, txq, &bf_head, NULL, &ts, 0);
continue;
}
@@ -1847,6 +1866,7 @@ static void ath_drain_txq_list(struct at
*/
void ath_draintxq(struct ath_softc *sc, struct ath_txq *txq)
{
+ rcu_read_lock();
ath_txq_lock(sc, txq);
if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
@@ -1865,6 +1885,7 @@ void ath_draintxq(struct ath_softc *sc,
ath_drain_txq_list(sc, txq, &txq->axq_q);
ath_txq_unlock_complete(sc, txq);
+ rcu_read_unlock();
}
bool ath_drain_all_txq(struct ath_softc *sc)
@@ -2487,7 +2508,8 @@ void ath_tx_cabq(struct ieee80211_hw *hw
/*****************/
static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
- int tx_flags, struct ath_txq *txq)
+ int tx_flags, struct ath_txq *txq,
+ struct ieee80211_sta *sta)
{
struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
@@ -2507,15 +2529,17 @@ static void ath_tx_complete(struct ath_s
tx_info->flags |= IEEE80211_TX_STAT_ACK;
}
- padpos = ieee80211_hdrlen(hdr->frame_control);
- padsize = padpos & 3;
- if (padsize && skb->len>padpos+padsize) {
- /*
- * Remove MAC header padding before giving the frame back to
- * mac80211.
- */
- memmove(skb->data + padsize, skb->data, padpos);
- skb_pull(skb, padsize);
+ if (tx_info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS) {
+ padpos = ieee80211_hdrlen(hdr->frame_control);
+ padsize = padpos & 3;
+ if (padsize && skb->len>padpos+padsize) {
+ /*
+ * Remove MAC header padding before giving the frame back to
+ * mac80211.
+ */
+ memmove(skb->data + padsize, skb->data, padpos);
+ skb_pull(skb, padsize);
+ }
}
spin_lock_irqsave(&sc->sc_pm_lock, flags);
@@ -2530,12 +2554,14 @@ static void ath_tx_complete(struct ath_s
}
spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
- __skb_queue_tail(&txq->complete_q, skb);
ath_txq_skb_done(sc, txq, skb);
+ tx_info->status.status_driver_data[0] = sta;
+ __skb_queue_tail(&txq->complete_q, 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 ieee80211_sta *sta,
struct ath_tx_status *ts, int txok)
{
struct sk_buff *skb = bf->bf_mpdu;
@@ -2563,7 +2589,7 @@ static void ath_tx_complete_buf(struct a
complete(&sc->paprd_complete);
} else {
ath_debug_stat_tx(sc, bf, ts, txq, tx_flags);
- ath_tx_complete(sc, skb, tx_flags, txq);
+ ath_tx_complete(sc, skb, tx_flags, txq, sta);
}
skip_tx_complete:
/* At this point, skb (bf->bf_mpdu) is consumed...make sure we don't
@@ -2715,10 +2741,12 @@ void ath_tx_tasklet(struct ath_softc *sc
u32 qcumask = ((1 << ATH9K_NUM_TX_QUEUES) - 1) & ah->intr_txqs;
int i;
+ rcu_read_lock();
for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
if (ATH_TXQ_SETUP(sc, i) && (qcumask & (1 << i)))
ath_tx_processq(sc, &sc->tx.txq[i]);
}
+ rcu_read_unlock();
}
void ath_tx_edma_tasklet(struct ath_softc *sc)
@@ -2732,6 +2760,7 @@ void ath_tx_edma_tasklet(struct ath_soft
struct list_head *fifo_list;
int status;
+ rcu_read_lock();
for (;;) {
if (test_bit(ATH_OP_HW_RESET, &common->op_flags))
break;
@@ -2802,6 +2831,7 @@ void ath_tx_edma_tasklet(struct ath_soft
ath_tx_process_buffer(sc, txq, &ts, bf, &bf_head);
ath_txq_unlock_complete(sc, txq);
}
+ rcu_read_unlock();
}
/*****************/
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