diff mbox series

[v3,4/4] wifi: rtw88: Enable USB RX aggregation for 8822c/8822b/8821c

Message ID 3b7b3655-9ec5-4277-b0ff-5535b1fdf281@gmail.com
State Superseded
Headers show
Series [v3,1/4] wifi: rtw88: usb: Init RX burst length according to USB speed | expand

Commit Message

Bitterblue Smith Aug. 6, 2024, 5:47 p.m. UTC 
Enable USB RX aggregation when there is at least 1 Mbps RX or TX
traffic, otherwise disable it.

USB RX aggregation improves the RX speed on certain ARM systems, like
the NanoPi NEO Core2. With RTL8821CU, before: 28 Mbps, after: 231 Mbps.

The official drivers for these chips use the same logic for SDIO, but
for some reason the SDIO driver in rtw88 always enables RX aggregation,
so this patch only toggles aggregation for USB devices.

RTL8703B is likely not found in USB devices, and RTL8723DU doesn't like
aggregation.

Tested-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
---
v3:
 - Add Tested-by: Sascha Hauer <s.hauer@pengutronix.de>

v2:
 - Rename {tx,rx}_unicast_shift to {tx,rx}_unicast_mbps.
 - Move the RX aggregation code from rtw8822c.c, rtw8822b.c, rtw8821c.c
   to usb.c.
 - Delete the rx_aggregation member from struct rtw_chip_ops and add
   dynamic_rx_agg member to struct rtw_hci_ops.
 - Rebase on top of the latest rtw-next.
---
 drivers/net/wireless/realtek/rtw88/hci.h  |  7 ++++
 drivers/net/wireless/realtek/rtw88/main.c | 13 +++++---
 drivers/net/wireless/realtek/rtw88/pci.c  |  1 +
 drivers/net/wireless/realtek/rtw88/sdio.c |  1 +
 drivers/net/wireless/realtek/rtw88/usb.c  | 40 +++++++++++++++++++++++
 5 files changed, 58 insertions(+), 4 deletions(-)

Comments

Ping-Ke Shih Aug. 7, 2024, 12:37 a.m. UTC | #1 
Bitterblue Smith <rtl8821cerfe2@gmail.com> wrote:
> @@ -236,13 +237,17 @@ static void rtw_watch_dog_work(struct work_struct *work)
>         else
>                 ps_active = false;
> 
> -       ewma_tp_add(&stats->tx_ewma_tp,
> -                   (u32)(stats->tx_unicast >> RTW_TP_SHIFT));
> -       ewma_tp_add(&stats->rx_ewma_tp,
> -                   (u32)(stats->rx_unicast >> RTW_TP_SHIFT));
> +       tx_unicast_mbps = stats->tx_unicast >> RTW_TP_SHIFT;
> +       rx_unicast_mbps = stats->rx_unicast >> RTW_TP_SHIFT;
> +
> +       ewma_tp_add(&stats->tx_ewma_tp, tx_unicast_mbps);
> +       ewma_tp_add(&stats->rx_ewma_tp, rx_unicast_mbps);
>         stats->tx_throughput = ewma_tp_read(&stats->tx_ewma_tp);
>         stats->rx_throughput = ewma_tp_read(&stats->rx_ewma_tp);
> 
> +       rtw_hci_dynamic_rx_agg(rtwdev,
> +                              tx_unicast_mbps >= 1 || rx_unicast_mbps >= 1);
> +

Not sure if you have tried RTL8822CU with this dynamic_rx_agg? 
I suspect RTL8822CU can't access IO before rtw_leave_lps(), at least RTL8822CE can't.
Let's move rtw_hci_dynamic_rx_agg() right after rtw_phy_dynamic_mechanism() below.

Sorry to forget this point on v2 review. 

>         /* reset tx/rx statictics */
>         stats->tx_unicast = 0;
>         stats->rx_unicast = 0;
Bitterblue Smith Aug. 7, 2024, 8:17 p.m. UTC | #2 
On 07/08/2024 03:37, Ping-Ke Shih wrote:
> Bitterblue Smith <rtl8821cerfe2@gmail.com> wrote:
>> @@ -236,13 +237,17 @@ static void rtw_watch_dog_work(struct work_struct *work)
>>         else
>>                 ps_active = false;
>>
>> -       ewma_tp_add(&stats->tx_ewma_tp,
>> -                   (u32)(stats->tx_unicast >> RTW_TP_SHIFT));
>> -       ewma_tp_add(&stats->rx_ewma_tp,
>> -                   (u32)(stats->rx_unicast >> RTW_TP_SHIFT));
>> +       tx_unicast_mbps = stats->tx_unicast >> RTW_TP_SHIFT;
>> +       rx_unicast_mbps = stats->rx_unicast >> RTW_TP_SHIFT;
>> +
>> +       ewma_tp_add(&stats->tx_ewma_tp, tx_unicast_mbps);
>> +       ewma_tp_add(&stats->rx_ewma_tp, rx_unicast_mbps);
>>         stats->tx_throughput = ewma_tp_read(&stats->tx_ewma_tp);
>>         stats->rx_throughput = ewma_tp_read(&stats->rx_ewma_tp);
>>
>> +       rtw_hci_dynamic_rx_agg(rtwdev,
>> +                              tx_unicast_mbps >= 1 || rx_unicast_mbps >= 1);
>> +
> 
> Not sure if you have tried RTL8822CU with this dynamic_rx_agg? 
> I suspect RTL8822CU can't access IO before rtw_leave_lps(), at least RTL8822CE can't.
> Let's move rtw_hci_dynamic_rx_agg() right after rtw_phy_dynamic_mechanism() below.
> 
> Sorry to forget this point on v2 review. 
> 
>>         /* reset tx/rx statictics */
>>         stats->tx_unicast = 0;
>>         stats->rx_unicast = 0;
> 
> 
> 

I received RTL8822CU (LM842) two days ago and tested these
patches with it, but I was too lazy to update the commit
messages. I didn't notice any problems. The RX speed measured
with iperf3 before was ~200 Mbps, after it's ~300 Mbps on my
x86_64 laptop.

I will move the function call.
diff mbox series

Patch

diff --git a/drivers/net/wireless/realtek/rtw88/hci.h b/drivers/net/wireless/realtek/rtw88/hci.h
index 830d7532f2a3..96aeda26014e 100644
--- a/drivers/net/wireless/realtek/rtw88/hci.h
+++ b/drivers/net/wireless/realtek/rtw88/hci.h
@@ -18,6 +18,7 @@  struct rtw_hci_ops {
 	void (*deep_ps)(struct rtw_dev *rtwdev, bool enter);
 	void (*link_ps)(struct rtw_dev *rtwdev, bool enter);
 	void (*interface_cfg)(struct rtw_dev *rtwdev);
+	void (*dynamic_rx_agg)(struct rtw_dev *rtwdev, bool enable);
 
 	int (*write_data_rsvd_page)(struct rtw_dev *rtwdev, u8 *buf, u32 size);
 	int (*write_data_h2c)(struct rtw_dev *rtwdev, u8 *buf, u32 size);
@@ -72,6 +73,12 @@  static inline void rtw_hci_interface_cfg(struct rtw_dev *rtwdev)
 	rtwdev->hci.ops->interface_cfg(rtwdev);
 }
 
+static inline void rtw_hci_dynamic_rx_agg(struct rtw_dev *rtwdev, bool enable)
+{
+	if (rtwdev->hci.ops->dynamic_rx_agg)
+		rtwdev->hci.ops->dynamic_rx_agg(rtwdev, enable);
+}
+
 static inline int
 rtw_hci_write_data_rsvd_page(struct rtw_dev *rtwdev, u8 *buf, u32 size)
 {
diff --git a/drivers/net/wireless/realtek/rtw88/main.c b/drivers/net/wireless/realtek/rtw88/main.c
index 9c58b7a41b95..fd944248e6e7 100644
--- a/drivers/net/wireless/realtek/rtw88/main.c
+++ b/drivers/net/wireless/realtek/rtw88/main.c
@@ -212,6 +212,7 @@  static void rtw_watch_dog_work(struct work_struct *work)
 	struct rtw_traffic_stats *stats = &rtwdev->stats;
 	struct rtw_watch_dog_iter_data data = {};
 	bool busy_traffic = test_bit(RTW_FLAG_BUSY_TRAFFIC, rtwdev->flags);
+	u32 tx_unicast_mbps, rx_unicast_mbps;
 	bool ps_active;
 
 	mutex_lock(&rtwdev->mutex);
@@ -236,13 +237,17 @@  static void rtw_watch_dog_work(struct work_struct *work)
 	else
 		ps_active = false;
 
-	ewma_tp_add(&stats->tx_ewma_tp,
-		    (u32)(stats->tx_unicast >> RTW_TP_SHIFT));
-	ewma_tp_add(&stats->rx_ewma_tp,
-		    (u32)(stats->rx_unicast >> RTW_TP_SHIFT));
+	tx_unicast_mbps = stats->tx_unicast >> RTW_TP_SHIFT;
+	rx_unicast_mbps = stats->rx_unicast >> RTW_TP_SHIFT;
+
+	ewma_tp_add(&stats->tx_ewma_tp, tx_unicast_mbps);
+	ewma_tp_add(&stats->rx_ewma_tp, rx_unicast_mbps);
 	stats->tx_throughput = ewma_tp_read(&stats->tx_ewma_tp);
 	stats->rx_throughput = ewma_tp_read(&stats->rx_ewma_tp);
 
+	rtw_hci_dynamic_rx_agg(rtwdev,
+			       tx_unicast_mbps >= 1 || rx_unicast_mbps >= 1);
+
 	/* reset tx/rx statictics */
 	stats->tx_unicast = 0;
 	stats->rx_unicast = 0;
diff --git a/drivers/net/wireless/realtek/rtw88/pci.c b/drivers/net/wireless/realtek/rtw88/pci.c
index 5d0580da13fb..0b9b8807af2c 100644
--- a/drivers/net/wireless/realtek/rtw88/pci.c
+++ b/drivers/net/wireless/realtek/rtw88/pci.c
@@ -1601,6 +1601,7 @@  static struct rtw_hci_ops rtw_pci_ops = {
 	.deep_ps = rtw_pci_deep_ps,
 	.link_ps = rtw_pci_link_ps,
 	.interface_cfg = rtw_pci_interface_cfg,
+	.dynamic_rx_agg = NULL,
 
 	.read8 = rtw_pci_read8,
 	.read16 = rtw_pci_read16,
diff --git a/drivers/net/wireless/realtek/rtw88/sdio.c b/drivers/net/wireless/realtek/rtw88/sdio.c
index 763aa8212a4b..21d0754dd7f6 100644
--- a/drivers/net/wireless/realtek/rtw88/sdio.c
+++ b/drivers/net/wireless/realtek/rtw88/sdio.c
@@ -1157,6 +1157,7 @@  static struct rtw_hci_ops rtw_sdio_ops = {
 	.deep_ps = rtw_sdio_deep_ps,
 	.link_ps = rtw_sdio_link_ps,
 	.interface_cfg = rtw_sdio_interface_cfg,
+	.dynamic_rx_agg = NULL,
 
 	.read8 = rtw_sdio_read8,
 	.read16 = rtw_sdio_read16,
diff --git a/drivers/net/wireless/realtek/rtw88/usb.c b/drivers/net/wireless/realtek/rtw88/usb.c
index 4c7ba5c76a57..cbb5e17e65d1 100644
--- a/drivers/net/wireless/realtek/rtw88/usb.c
+++ b/drivers/net/wireless/realtek/rtw88/usb.c
@@ -766,6 +766,45 @@  static void rtw_usb_interface_cfg(struct rtw_dev *rtwdev)
 	rtw_usb_init_burst_pkt_len(rtwdev);
 }
 
+static void rtw_usb_dynamic_rx_agg_v1(struct rtw_dev *rtwdev, bool enable)
+{
+	u8 size, timeout;
+	u16 val16;
+
+	rtw_write32_set(rtwdev, REG_RXDMA_AGG_PG_TH, BIT_EN_PRE_CALC);
+	rtw_write8_set(rtwdev, REG_TXDMA_PQ_MAP, BIT_RXDMA_AGG_EN);
+	rtw_write8_clr(rtwdev, REG_RXDMA_AGG_PG_TH + 3, BIT(7));
+
+	if (enable) {
+		size = 0x5;
+		timeout = 0x20;
+	} else {
+		size = 0x0;
+		timeout = 0x1;
+	}
+	val16 = u16_encode_bits(size, BIT_RXDMA_AGG_PG_TH) |
+		u16_encode_bits(timeout, BIT_DMA_AGG_TO_V1);
+
+	rtw_write16(rtwdev, REG_RXDMA_AGG_PG_TH, val16);
+}
+
+static void rtw_usb_dynamic_rx_agg(struct rtw_dev *rtwdev, bool enable)
+{
+	switch (rtwdev->chip->id) {
+	case RTW_CHIP_TYPE_8822C:
+	case RTW_CHIP_TYPE_8822B:
+	case RTW_CHIP_TYPE_8821C:
+		rtw_usb_dynamic_rx_agg_v1(rtwdev, enable);
+		break;
+	case RTW_CHIP_TYPE_8723D:
+		/* Doesn't like aggregation. */
+		break;
+	case RTW_CHIP_TYPE_8703B:
+		/* Likely not found in USB devices. */
+		break;
+	}
+}
+
 static struct rtw_hci_ops rtw_usb_ops = {
 	.tx_write = rtw_usb_tx_write,
 	.tx_kick_off = rtw_usb_tx_kick_off,
@@ -775,6 +814,7 @@  static struct rtw_hci_ops rtw_usb_ops = {
 	.deep_ps = rtw_usb_deep_ps,
 	.link_ps = rtw_usb_link_ps,
 	.interface_cfg = rtw_usb_interface_cfg,
+	.dynamic_rx_agg = rtw_usb_dynamic_rx_agg,
 
 	.write8  = rtw_usb_write8,
 	.write16 = rtw_usb_write16,