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Message-ID: <094e993a-a709-07b8-0c1a-4ccea11e7072@broadcom.com>
Date:   Tue, 3 Jan 2023 10:57:14 +0100
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Subject: Re: brcmfmac: Unexpected cfg80211_set_channel: set chanspec ... fail,
 reason -52
To:     Johannes Berg <johannes@sipsolutions.net>,
        Stefan Wahren <stefan.wahren@i2se.com>,
        Arend van Spriel <aspriel@gmail.com>,
        Franky Lin <franky.lin@broadcom.com>,
        Hante Meuleman <hante.meuleman@broadcom.com>
Cc:     linux-wireless@vger.kernel.org,
        brcm80211-dev-list.pdl@broadcom.com,
        SHA-cyfmac-dev-list@infineon.com
References: <2635fd4f-dfa0-1d87-058b-e455cee96750@i2se.com>
 <1f428e2b-f73f-64ff-02d3-eefbcd11db89@broadcom.com>
 <ee24c4eda8d389ac7197b6296944e168ccc6b602.camel@sipsolutions.net>
From:   Arend van Spriel <arend.vanspriel@broadcom.com>
In-Reply-To: <ee24c4eda8d389ac7197b6296944e168ccc6b602.camel@sipsolutions.net>
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On 1/3/2023 8:07 AM, Johannes Berg wrote:
> Hi,
> 
> 
>>> [  104.897615] brcmfmac: cfg80211_set_channel: set chanspec 0x100e fail,
>>> reason -52
> 
> [...]
> 
>>
>>> All of these 10 errors are repeated every 60 sec.
>>
>> Catching up after the holidays ;-) Above chanspec values are invalid.
>> 0x100e = channel 14/bw 20MHz. The 'iw list' output shows all these
>> channels are disabled. So who/what is trying to set these channels.
>> Scanning sets the channel in firmware. Is this initiated from hostapd?
> 
> Yeah, what userspace is running here? Looks like cfg80211_set_channel()
> is only used for survey?
> 
> Couple of observations on the side:
>   * might be nice to have some "brcm" indication in that name :P
>   * dump_survey should just dump data, not actually implement the data
>     collection, I think?

commit 6c04deae1438e5df59fc4848795248fc34961f51
Author: Wright Feng <wright.feng@cypress.com>
Commit: Kalle Valo <kvalo@kernel.org>

     brcmfmac: Add dump_survey cfg80211 ops for HostApd AutoChannelSelection

     To enable ACS feature in Hostap daemon, dump_survey cfg80211 ops 
and dump
     obss survey command in firmware side are needed. This patch is for 
adding
     dump_survey feature and adding DUMP_OBSS feature flag to check if
     firmware supports dump_obss iovar.

     Signed-off-by: Wright Feng <wright.feng@cypress.com>
     Signed-off-by: Chi-hsien Lin <chi-hsien.lin@cypress.com>
     Signed-off-by: Ian Lin <ian.lin@infineon.com>
     Signed-off-by: Kalle Valo <kvalo@kernel.org>
     Link: 
https://lore.kernel.org/r/20220929012527.4152-2-ian.lin@infineon.com

I did comment on one of the patches in the series, but I now I looked at 
the diff and it is giving me the infamous eyeball cancer paraphrasing 
John Linville.

>> Maybe trying ACS?
>>
> 
> Seems it must be something like that.
> 
>> As these are marked as disabled user-space should not
>> use them. What I don't understand is why these pass the cfg80211 layer
>> so adding Johannes here.
>>
> 
> Well that goes back to my earlier observation above: dump_survey()
> should just dump all *available* data, not actually try to *collect*
> data. So if userspace requests data for a channel that's disabled,
> that's actually OK, but you shouldn't _have_ any data for that channel
> since it's disabled. Also nl80211 won't send the data out if it exists,
> but there's no check to see if asking the driver makes sense since if
> it's a channel that exists, it should be valid to ask the driver if it
> has data - it just shouldn't have any.
> 
> The way it works in mac80211 is that survey data is collected during
> scan, I think?

My assumption is that our scan does not collect the survey data so this 
implementation initiates a dedicated scan/measurement/survey/whatever 
and returns the results. Might have been better to propose a scan flag 
so this could be initiated upon a scan request.

Anyway, I see in nl80211.c we are skipping sending up survey data for 
disable channels. So let me send a quick patch for avoiding the error 
messages and renaming the function. Thanks for your thought. Always 
appreciated. Best wishes for 2023.

Gr. AvS

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