USB RX aggregation improves the RX speed on certain ARM systems, like
the NanoPi NEO Core2. With RTL8811AU, before: 30 Mbps, after: 224 Mbps.
The out-of-tree driver uses aggregation size of 7 in USB 3 mode, but
that doesn't work here. rtw88 advertises support for receiving AMSDU
in AMPDU, so the AP sends larger frames, up to ~5100 bytes. With a size
of 7 RTL8812AU frequently tries to aggregate more frames than will fit
in 32768 bytes. Use a size of 6 instead.
Signed-off-by: Bitterblue Smith <rtl8821cerfe2@xxxxxxxxx>
---
drivers/net/wireless/realtek/rtw88/usb.c | 30 ++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/drivers/net/wireless/realtek/rtw88/usb.c b/drivers/net/wireless/realtek/rtw88/usb.c
index 752bca05b9af..9172af63500b 100644
--- a/drivers/net/wireless/realtek/rtw88/usb.c
+++ b/drivers/net/wireless/realtek/rtw88/usb.c
@@ -790,6 +790,32 @@ static void rtw_usb_dynamic_rx_agg_v1(struct rtw_dev *rtwdev, bool enable)
rtw_write16(rtwdev, REG_RXDMA_AGG_PG_TH, val16);
}
+static void rtw_usb_dynamic_rx_agg_v2(struct rtw_dev *rtwdev, bool enable)
+{
+ struct rtw_usb *rtwusb = rtw_get_usb_priv(rtwdev);
+ u8 size, timeout;
+ u16 val16;
+
+ if (rtwusb->udev->speed == USB_SPEED_SUPER) {
+ size = 0x6;
+ timeout = 0x1a;
+ } else {
+ size = 0x5;
+ timeout = 0x20;
+ }
+
+ if (!enable) {
+ 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);
+ rtw_write8_set(rtwdev, REG_TXDMA_PQ_MAP, BIT_RXDMA_AGG_EN);
+}
+
static void rtw_usb_dynamic_rx_agg(struct rtw_dev *rtwdev, bool enable)
{
switch (rtwdev->chip->id) {
@@ -798,6 +824,10 @@ static void rtw_usb_dynamic_rx_agg(struct rtw_dev *rtwdev, bool enable)
case RTW_CHIP_TYPE_8821C:
rtw_usb_dynamic_rx_agg_v1(rtwdev, enable);
break;
+ case RTW_CHIP_TYPE_8821A:
+ case RTW_CHIP_TYPE_8812A:
+ rtw_usb_dynamic_rx_agg_v2(rtwdev, enable);
+ break;
case RTW_CHIP_TYPE_8723D:
/* Doesn't like aggregation. */
break;
--
2.47.0
