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From: Arend Van Spriel <arend.vanspriel@broadcom.com>
To: Johannes Berg <johannes@sipsolutions.net>, Alexey Berezhok <a@bayrepo.ru>, Arend van Spriel <aspriel@gmail.com>
CC: Kalle Valo <kvalo@kernel.org>, <linux-wireless@vger.kernel.org>, <lvc-project@linuxtesting.org>
Date: Thu, 08 Feb 2024 16:56:55 +0100
Message-ID: <18d896fb158.279b.9b12b7fc0a3841636cfb5e919b41b954@broadcom.com>
In-Reply-To: <4e3b72023f30d8765154805816e6eb1f4e73593c.camel@sipsolutions.net>
References: <20240208085121.2430-1-a@bayrepo.ru>
 <1bc49c2a-1f62-4801-90c3-048b27f6475c@broadcom.com>
 <4e3b72023f30d8765154805816e6eb1f4e73593c.camel@sipsolutions.net>
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Subject: Re: [PATCH] wifi: brcmfmac: do not cast hidden SSID attribute value to boolean
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On February 8, 2024 3:15:25 PM Johannes Berg <johannes@sipsolutions.net> wrote:

> On Thu, 2024-02-08 at 15:06 +0100, Arend van Spriel wrote:
>>
>> settings->hidden_ssid has already been used above in following call:
>>
>> err = brcmf_fil_iovar_int_set(ifp, "closednet",
>>   settings->hidden_ssid);
>>
>> So we pass the value as is to firmware using the same assumption, ie.
>> NL80211_HIDDEN_SSID_NOT_IN_USE. Is this not ABI thus very unlikely to
>> change?
>
> The ABI won't change, that'd break all the users of nl80211 that use
> this :-)

Right. So basically the assumption that NL80211_HIDDEN_SSID_NOT_IN_USE is 
and will be zero is a safe one.

>
>> @Johannes:
>> Actually not quite understanding the reason for having this setting in
>> nl80211. hidden_ssid means SSID element length is zero, right?
>
> Well, there at least _were_ APs doing the correct SSID length but
> setting all octets to zero ... Not sure that's still a thing though.

I now looked at the definition and see indeed two distinct flavours of 
"hidden SSID". Interesting although I have never considered it a useful 
feature.

Regards,
Arend


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