[PATCH] wireless: fix wrong 160/80+80 MHz setting

[Shay Bar]

On 30/12/2020 12:57, Wen Gong wrote:
>
> On 2020-08-26 22:31, Shay Bar wrote:
>> Fix cfg80211_chandef_usable():
>> consider IEEE80211_VHT_CAP_EXT_NSS_BW when verifying 160/80+80 MHz.
>>
> When station with below 2 bit and connect to a 160MHZ 11ac mode AP, it
> will try to use 160Mhz width after this patch,
> but it does not support 160M in fact according spec of IEEE 802.11
> .... .... .... .... .... .... .... 00.. = Supported Channel Width Set:
> Neither 160MHz nor 80+80 supported (0x0)
> 01.. .... .... .... .... .... .... .... = Extended NSS BW Support: 0x1
>
> refer to spec of IEEE 802.11.
> Table 9-250—Setting of the Supported Channel Width Set subfield and
> Extended NSS BW Support subfield at a STA transmitting the VHT
> Capabilities Information field
> value of the 160Mhz is 1/2 in the table for upper configure.
> NOTE 2—1/2× or 3/4× Max VHT NSS support might end up being 0, indicating
> no support.
>

You mean for AP's with 1 SS for example ?