[PATCH rtw-next 02/11] wifi: rtw89: pci: reclaim TXBD before fully draining

[Ping-Ke Shih <pkshih@realtek.com>]

From: Kuan-Chung Chen <damon.chen@realtek.com>

Currently, we reclaim TXBD only when the available resource is 0.
When two ACs share the same DMA channel, the lower-priority AC
occupies the whole channel, which affects the higher-priority
AC's throughput.

Add RTW89_PCI_TXBD_RECLAIM_TH to reclaim early once the
available resource falls below it, improving TX
fairness between ACs sharing a DMA channel.

Signed-off-by: Kuan-Chung Chen <damon.chen@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
---
 drivers/net/wireless/realtek/rtw89/pci.c | 4 ++--
 drivers/net/wireless/realtek/rtw89/pci.h | 1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw89/pci.c b/drivers/net/wireless/realtek/rtw89/pci.c
index 6d19e759fc0d..76523d057825 100644
--- a/drivers/net/wireless/realtek/rtw89/pci.c
+++ b/drivers/net/wireless/realtek/rtw89/pci.c
@@ -1281,7 +1281,7 @@ static u32 __rtw89_pci_check_and_reclaim_tx_resource(struct rtw89_dev *rtwdev,
 	bd_cnt = rtw89_pci_get_avail_txbd_num(tx_ring);
 	wd_cnt = wd_ring->curr_num;
 
-	if (wd_cnt == 0 || bd_cnt == 0) {
+	if (wd_cnt == 0 || bd_cnt < RTW89_PCI_TXBD_RECLAIM_TH) {
 		cnt = rtw89_pci_rxbd_recalc(rtwdev, rx_ring);
 		if (cnt)
 			rtw89_pci_release_tx(rtwdev, rx_ring, cnt);
@@ -1289,7 +1289,7 @@ static u32 __rtw89_pci_check_and_reclaim_tx_resource(struct rtw89_dev *rtwdev,
 			goto out_unlock;
 
 		bd_cnt = rtw89_pci_get_avail_txbd_num(tx_ring);
-		if (bd_cnt == 0)
+		if (bd_cnt < RTW89_PCI_TXBD_RECLAIM_TH)
 			rtw89_pci_reclaim_txbd(rtwdev, tx_ring);
 	}
 
diff --git a/drivers/net/wireless/realtek/rtw89/pci.h b/drivers/net/wireless/realtek/rtw89/pci.h
index 0f9ea4bf54ea..3cc484bc1ca8 100644
--- a/drivers/net/wireless/realtek/rtw89/pci.h
+++ b/drivers/net/wireless/realtek/rtw89/pci.h
@@ -1120,6 +1120,7 @@
 #define B_BE_MAX_TAG_NUM_MASK GENMASK(3, 0)
 
 #define RTW89_PCI_TXBD_NUM_MAX		256
+#define RTW89_PCI_TXBD_RECLAIM_TH	(RTW89_PCI_TXBD_NUM_MAX >> 1)
 #define RTW89_PCI_RXBD_NUM_MAX		256
 #define RTW89_PCI_TXWD_NUM_MAX		512
 #define RTW89_PCI_TXWD_PAGE_SIZE	128
-- 
2.53.0