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Subject: Re: [PATCH 01/13] wifi: cfg80211: Add provision to advertise
 multiple radio in one wiphy
From: Maxime Bizon <mbizon@freebox.fr>
Reply-To: mbizon@freebox.fr
To: Vasanthakumar Thiagarajan <quic_vthiagar@quicinc.com>, Jeff Johnson
 <quic_jjohnson@quicinc.com>, Ben Greear <greearb@candelatech.com>, Johannes
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 <quic_periyasa@quicinc.com>,  ath12k@lists.infradead.org
Cc: linux-wireless@vger.kernel.org
Date: Thu, 11 Apr 2024 18:39:03 +0200
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On Thu, 2024-04-11 at 21:56 +0530, Vasanthakumar Thiagarajan wrote:

Hello,

Thanks for making it clear,


> > For example, starting a 5Ghz AP in ax-only mode, and at the same
> > time
> > creating a STA interface on 2.4GHz ?

> Yes, such use cases continue to be supported in single wiphy mode.

Understood, but I see some corner cases.


For example, assume two bands AP hardware, 2.4GHz and 5GHz.

Previously:
  - phy0 is 2.4Ghz
  - phy1 is 5Ghz
  - iw phy phy0 interface create wlan0 type managed
  - iw dev wlan0 scan

=3D> will only scan 2.4Ghz


With single phy approach:
  - phy0 is 2.4Ghz + 5Ghz concurrent
  - # iw phy phy0 interface create wlan0 type managed
  - # iw dev wlan0 scan

=3D> will scan both bands ?

  - <starting from previous state>
  - # iw phy phy0 interface create wlan1 type __ap
  - # hostapd -i wlan1 <config>
  - # iw dev wlan0 scan

=3D> what will happen then ?


Same goes for hostapd ACS, I assume specifying freqlist becomes
mandatory or we can't predict which band the AP will be on ?

--=20
Maxime