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Subject: Re: [RFC 0/8] nl80211: add 6GHz band support
From:   Arend Van Spriel <arend.vanspriel@broadcom.com>
To:     Johannes Berg <johannes@sipsolutions.net>
Cc:     linux-wireless@vger.kernel.org
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Date:   Mon, 27 May 2019 22:46:53 +0200
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On 5/24/2019 8:38 PM, Arend Van Spriel wrote:
> On May 24, 2019 1:56:43 PM Johannes Berg <johannes@sipsolutions.net> wrote:
> 
>> Hi Arend,
>>
>> On Mon, 2019-05-20 at 14:00 +0200, Arend van Spriel wrote:
>>> In 802.11ax D4.0 a new band has been proposed. This series contains
>>> changes to cfg80211 for supporting this band. With 2GHz and 5GHz there
>>> was no overlap in channel number. However, this new band has channel
>>> numbers with a range from 1 up to 253.
>>
>> At the wireless workshop in Prague, we looked at this and sort of
>> decided that it'd be better to put all the 6 GHz channels into the 5 GHz
>> "band" in nl80211, to avoid all the "5 || 6" since they're really the
>> same except for very specific places like scanning.
> 
> Would have liked to be there, but attending is no longer an option for 
> me. We now have two autistic, non-verbal children and I am the primary 
> caregiver for the oldest because my wife can't handle him. Guess I 
> should have checked the workshop notes before working on this :-) Do you 
> have URL?

Found the netdev wifi workshop page and looked over the slides quickly, 
but the notes page is pretty empty ;-)

> Agree that most functional requirements for 6 GHz are same as 5 GHz. 
> There are some 6 GHz specifics about beaconing as well.

This came up in discussion with my colleagues today and I would say from 
mac80211 perspective there is more to it than just scanning. In short 
the 6GHz band is for HE-only operation so for example only HE rates may 
be used. As the bitrates are in ieee80211_supported_band having a 
separate 6GHz band seems to have a (slight?) advantage.

Regards,
Arend