2019-02-28 13:31:55

by Lorenzo Bianconi

Subject: [PATCH v2] mt76: introduce q->stopped parameter

Introduce mt76_queue stopped parameter in order to run
ieee80211_wake_queue only when mac80211 queues have been
previously stopped and avoid to disable interrupts when
it is not necessary

Signed-off-by: Lorenzo Bianconi <[email protected]>
---
Changes since v1:
- move back ieee80211_stop_queue() inside q->lock critical section
---
drivers/net/wireless/mediatek/mt76/dma.c | 5 ++++-
drivers/net/wireless/mediatek/mt76/mt76.h | 1 +
drivers/net/wireless/mediatek/mt76/tx.c | 5 ++++-
drivers/net/wireless/mediatek/mt76/usb.c | 6 +++++-
4 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/dma.c b/drivers/net/wireless/mediatek/mt76/dma.c
index 6eedc0ec7661..99e341cb1f92 100644
--- a/drivers/net/wireless/mediatek/mt76/dma.c
+++ b/drivers/net/wireless/mediatek/mt76/dma.c
@@ -180,7 +180,10 @@ mt76_dma_tx_cleanup(struct mt76_dev *dev, enum mt76_txq_id qid, bool flush)
else
mt76_dma_sync_idx(dev, q);

- wake = wake && qid < IEEE80211_NUM_ACS && q->queued < q->ndesc - 8;
+ wake = wake && q->stopped &&
+ qid < IEEE80211_NUM_ACS && q->queued < q->ndesc - 8;
+ if (wake)
+ q->stopped = false;

if (!q->queued)
wake_up(&dev->tx_wait);
diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
index 5dfb0601f101..3152b8c73c4a 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -126,6 +126,7 @@ struct mt76_queue {
int ndesc;
int queued;
int buf_size;
+ bool stopped;

u8 buf_offset;
u8 hw_idx;
diff --git a/drivers/net/wireless/mediatek/mt76/tx.c b/drivers/net/wireless/mediatek/mt76/tx.c
index 5a349fe3e576..4d38a54014e8 100644
--- a/drivers/net/wireless/mediatek/mt76/tx.c
+++ b/drivers/net/wireless/mediatek/mt76/tx.c
@@ -289,8 +289,11 @@ mt76_tx(struct mt76_dev *dev, struct ieee80211_sta *sta,
dev->queue_ops->tx_queue_skb(dev, q, skb, wcid, sta);
dev->queue_ops->kick(dev, q);

- if (q->queued > q->ndesc - 8)
+ if (q->queued > q->ndesc - 8 && !q->stopped) {
ieee80211_stop_queue(dev->hw, skb_get_queue_mapping(skb));
+ q->stopped = true;
+ }
+
spin_unlock_bh(&q->lock);
}
EXPORT_SYMBOL_GPL(mt76_tx);
diff --git a/drivers/net/wireless/mediatek/mt76/usb.c b/drivers/net/wireless/mediatek/mt76/usb.c
index ae6ada370597..4c1abd492405 100644
--- a/drivers/net/wireless/mediatek/mt76/usb.c
+++ b/drivers/net/wireless/mediatek/mt76/usb.c
@@ -655,7 +655,11 @@ static void mt76u_tx_tasklet(unsigned long data)
spin_lock_bh(&q->lock);
}
mt76_txq_schedule(dev, q);
- wake = i < IEEE80211_NUM_ACS && q->queued < q->ndesc - 8;
+
+ wake = q->stopped && q->queued < q->ndesc - 8;
+ if (wake)
+ q->stopped = false;
+
if (!q->queued)
wake_up(&dev->tx_wait);

--
2.20.1

2019-03-01 14:22:23

by Felix Fietkau

Subject: Re: [PATCH v2] mt76: introduce q->stopped parameter

On 2019-02-28 14:31, Lorenzo Bianconi wrote:
> Introduce mt76_queue stopped parameter in order to run
> ieee80211_wake_queue only when mac80211 queues have been
> previously stopped and avoid to disable interrupts when
> it is not necessary
>
> Signed-off-by: Lorenzo Bianconi <[email protected]>
Applied, thanks.

- Felix