RE: [PATCH v3] wifi: rtw88: usb: Further limit the TX aggregation

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

Bitterblue Smith <rtl8821cerfe2@gmail.com> wrote:
> Currently the number of frames sent to the chip in a single USB Request
> Block is limited only by the size of the TX buffer, which is 20 KiB.
> Testing reveals that as many as 13 frames get aggregated. This is more
> than what any of the chips would like to receive. RTL8822CU, RTL8822BU,
> and RTL8821CU want at most 3 frames, and RTL8723DU wants only 1 frame
> per URB.
> 
> RTL8723DU in particular reliably malfunctions during a speed test if it
> receives more than 1 frame per URB. All traffic seems to stop. Pinging
> the AP no longer works.
> 
> Fix this problem by limiting the number of frames sent to the chip in a
> single URB according to what each chip likes.
> 
> Also configure RTL8822CU, RTL8822BU, and RTL8821CU to expect 3 frames
> per URB.
> 
> RTL8703B may or may not be found in USB devices. Declare that it wants
> only 1 frame per URB, just in case.
> 
> Tested with RTL8723DU and RTL8811CU.
> 
> Cc: stable@vger.kernel.org
> Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>

Acked-by: Ping-Ke Shih <pkshih@realtek.com>