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wifi: rtw88: usb: Enable RX aggregation for 8821au/8812au

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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@gmail.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/63012163-a425-4b15-b830-43f279c06b73@gmail.com
This commit is contained in:
Bitterblue Smith 2024-11-14 17:48:09 +02:00 committed by Ping-Ke Shih
parent 82a35723a6
commit ce5dea83ee
1 changed files with 28 additions and 0 deletions
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28
drivers/net/wireless/realtek/rtw88/usb.c
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@ -789,6 +789,30 @@ 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 (!enable) {
size = 0x0;
timeout = 0x1;
} else if (rtwusb->udev->speed == USB_SPEED_SUPER) {
size = 0x6;
timeout = 0x1a;
} else {
size = 0x5;
timeout = 0x20;
}
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) {
@ -797,6 +821,10 @@ 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;