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Message-ID: <b35c9cfbf275d1581ccbc2b2dba39d316a725079.camel@coelho.fi>
From:   Luca Coelho <luca@coelho.fi>
To:     Ben Greear <greearb@candelatech.com>, kvalo@codeaurora.org,
        ilan.peer@intel.com
Cc:     linux-wireless@vger.kernel.org
Date:   Sun, 11 Apr 2021 12:41:44 +0300
In-Reply-To: <aa0dae40-1565-2bb0-b33f-0da82a8de137@candelatech.com>
References: <20210331091452.543321-1-luca@coelho.fi>
         <iwlwifi.20210331121101.7c7bd00e0aeb.Ib226ad57e416b43a710c36a78a617d4243458b99@changeid>
         <aa0dae40-1565-2bb0-b33f-0da82a8de137@candelatech.com>
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Subject: Re: [PATCH 06/12] iwlwifi: mvm: Add support for 6GHz passive scan
Precedence: bulk

On Wed, 2021-03-31 at 05:03 -0700, Ben Greear wrote:
> On 3/31/21 2:14 AM, Luca Coelho wrote:
> > From: Ilan Peer <ilan.peer@intel.com>
> > 
> > When doing scan while 6GHz channels are not enabled, the 6GHz band
> > is not scanned. Thus, if there are no APs on the 2GHz and 5GHz bands
> > (that will allow discovery of geographic location etc. that would
> > allow enabling the 6GHz channels) but there are non collocated APs
> > on 6GHz PSC channels these would never be discovered.
> > 
> > To overcome this, FW added support for performing passive UHB scan
> > in case no APs were discovered during scan on the 2GHz and 5GHz
> > channels.
> > 
> > Add support for enabling such scan when the following conditions are
> > met:
> > 
> > - 6GHz channels are supported but not enabled by regulatory.
> > - Station interface is not associated or less than a defined time
> >    interval passed from the last resume or HW reset flows.
> > - At least 4 channels are included in the scan request
> > - The scan request includes the widlcard SSID.
> > - At least 50 minutes passed from the last 6GHz passive scan.
> 
> Why are you trying so hard to not do passive scans?  This seems like it
> is set up for all sorts of frustration.

This is because of regulatory restrictions.  Maybe Ilan can clarify
more.

--
Cheers,
Luca.