Re: [PATCH] mac80211: Let VHT work on 2.4Ghz

[Ben Greear <greearb@candelatech.com>]

On 02/24/2016 12:40 AM, Arik Nemtsov wrote:
> On Tue, Feb 23, 2016 at 3:46 PM, Ben Greear <greearb@candelatech.com> wrote:
>>
>>
>> On 02/23/2016 02:47 AM, Arik Nemtsov wrote:
>>>
>>> On Tue, Feb 23, 2016 at 12:42 AM, <greearb@candelatech.com> wrote:
>>>>
>>>>
>>>> From: Ben Greear <greearb@candelatech.com>
>>>>
>>>> ath10k supports VHT on 2.4Ghz band.
>>>> If supplicant and hostapd and radio think
>>>> VHT should be allowed, then kernel should let them
>>>> try.
>>>
>>>
>>> Removing the 80Mhz check entirely is not the right way to go IMO. The
>>> check is there because there are countries where VHT rates are not
>>> allowed, even on 20MHz channels. We use the fact these countries have
>>> no 80MHz-allowed ranges as a crude regulatory hint to disable VHT
>>> entirely. I'm not sure about the regulatory landscape in these
>>> countries regarding VHT in 2.4GHz, but please don't break compliance
>>> for the 5Ghz use-case.
>>
>>
>> Maybe someone can fix the regulatory logic then?
>>
>> Add a no-vht flag or whatever?
>
> This is more tricky that it looks at first - basically current
> regulatory "hooks" concern channel width and location, transmit power
> etc. Here regulatory compliance means never emitting the VHT IE in
> probe requests etc. So a "no vht" flag would be useless to the reg.c
> code - it currently never looks at IEs. Some cards even generate them
> at the FW level.
> All in all I think the current small bit of ugliness is justified for
> regulatory compliance.
>
> Also it's pretty easy to just leave the code there and condition the
> check on the 5GHz band. There's no need to remove it.

Ok, so I can enable VHT on any band as long as the 5Ghz band exists and
allows 80Mhz?

Thanks,
Ben

>
>>
>> Any idea which countries this applies to?
>
> I know Russia is one such country. Not sure about others.
>
> Arik
>

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com