[v4,2/2] ath10k: Enable Airtime-based Queue Limit (AQL)

Commit Message

Kan Yan Oct. 11, 2019, 2:24 a.m. UTC

Calculate the estimated airtime pending in the txqs and apply AQL to
prevent excessive amounts of packets being queued in the firmware queue.

Signed-off-by: Kan Yan <[e-mail]>
---
 drivers/net/wireless/ath/ath10k/htt_rx.c |  1 +
 drivers/net/wireless/ath/ath10k/mac.c    |  6 ++++--
 drivers/net/wireless/ath/ath10k/txrx.c   | 11 ++++++++---
 3 files changed, 13 insertions(+), 5 deletions(-)

Comments

Kalle Valo Oct. 14, 2019, 9:23 a.m. UTC | #1

Kan Yan <[e-mail]> writes:

> Calculate the estimated airtime pending in the txqs and apply AQL to
> prevent excessive amounts of packets being queued in the firmware queue.
>
> Signed-off-by: Kan Yan <[e-mail]>

Forgot to mention earlier that please add tested hardware and firmware
versions:

https://wireless.wiki.kernel.org/en/users/drivers/ath10k/submittingpatches#guidelines

I can also add that during commit, no need to resend because of this.

Kalle Valo Oct. 22, 2019, 7:41 a.m. UTC | #2

Kan Yan <[e-mail]> wrote:

> Calculate the estimated airtime pending in the txqs and apply AQL to
> prevent excessive amounts of packets being queued in the firmware queue.
> 
> Signed-off-by: Kan Yan <[e-mail]>

Dropped per Kan's and Toke's comment:

https://lkml.kernel.org/r/[e-mail]

Patch set to Rejected.

Patch

diff --git a/drivers/net/wireless/ath/ath10k/htt_rx.c b/drivers/net/wireless/ath/ath10k/htt_rx.c
index 83a7fb68fd24..12d63fa02e8e 100644
--- a/drivers/net/wireless/ath/ath10k/htt_rx.c
+++ b/drivers/net/wireless/ath/ath10k/htt_rx.c
@@ -3053,6 +3053,7 @@  static void ath10k_htt_rx_tx_fetch_ind(struct ath10k *ar, struct sk_buff *skb)
 
 			num_msdus++;
 			num_bytes += ret;
+			may_tx = ieee80211_txq_airtime_check(hw, txq);
 		}
 		ieee80211_return_txq(hw, txq, false);
 		ieee80211_txq_schedule_end(hw, txq->ac);
diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index 0606416dc971..ed19a40c2c3a 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -3983,6 +3983,9 @@  static bool ath10k_mac_tx_can_push(struct ieee80211_hw *hw,
 	struct ath10k_txq *artxq = (void *)txq->drv_priv;
 
 	/* No need to get locks */
+	if (!ieee80211_txq_airtime_check(hw, txq))
+		return false;
+
 	if (ar->htt.tx_q_state.mode == HTT_TX_MODE_SWITCH_PUSH)
 		return true;
 
@@ -4014,8 +4017,6 @@  static u16 ath10k_mac_update_airtime(struct ath10k *ar,
 	if (!txq || !txq->sta)
 		return airtime;
 
-	if (test_bit(WMI_SERVICE_REPORT_AIRTIME, ar->wmi.svc_map))
-		return airtime;
 
 	spin_lock_bh(&ar->data_lock);
 	arsta = (struct ath10k_sta *)txq->sta->drv_priv;
@@ -4038,6 +4039,7 @@  static u16 ath10k_mac_update_airtime(struct ath10k *ar,
 	}
 	spin_unlock_bh(&ar->data_lock);
 
+	ieee80211_sta_register_pending_airtime(txq->sta, txq->tid, airtime);
 	return airtime;
 }
 
diff --git a/drivers/net/wireless/ath/ath10k/txrx.c b/drivers/net/wireless/ath/ath10k/txrx.c
index 4102df016931..739046b34d4b 100644
--- a/drivers/net/wireless/ath/ath10k/txrx.c
+++ b/drivers/net/wireless/ath/ath10k/txrx.c
@@ -84,9 +84,14 @@  int ath10k_txrx_tx_unref(struct ath10k_htt *htt,
 		wake_up(&htt->empty_tx_wq);
 	spin_unlock_bh(&htt->tx_lock);
 
-	if (txq && txq->sta && skb_cb->airtime_est)
-		ieee80211_sta_register_airtime(txq->sta, txq->tid,
-					       skb_cb->airtime_est, 0);
+	if (txq && txq->sta && skb_cb->airtime_est) {
+		if (!test_bit(WMI_SERVICE_REPORT_AIRTIME, ar->wmi.svc_map))
+			ieee80211_sta_register_airtime(txq->sta, txq->tid,
+						       skb_cb->airtime_est, 0);
+
+		ieee80211_sta_release_pending_airtime(txq->sta, txq->tid,
+						      skb_cb->airtime_est);
+	}
 
 	if (ar->bus_param.dev_type != ATH10K_DEV_TYPE_HL)
 		dma_unmap_single(dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE);