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Message-ID: <c392f901-789a-42e2-8cf7-5e246365a1ca@broadcom.com>
Date: Tue, 19 Dec 2023 14:46:43 +0100
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Subject: Re: [PATCH] wifi: brcmfmac: cfg80211: Use WSEC to set SAE password
To: Hector Martin <marcan@marcan.st>, Kalle Valo <kvalo@kernel.org>
Cc: Arend van Spriel <aspriel@gmail.com>, Franky Lin
 <franky.lin@broadcom.com>, Hante Meuleman <hante.meuleman@broadcom.com>,
 Daniel Berlin <dberlin@dberlin.org>, linux-wireless@vger.kernel.org,
 brcm80211-dev-list.pdl@broadcom.com, SHA-cyfmac-dev-list@infineon.com,
 linux-kernel@vger.kernel.org, asahi@lists.linux.dev
References: <20231107-brcmfmac-wpa3-v1-1-4c7db8636680@marcan.st>
 <170281231651.2255653.7498073085103487666.kvalo@kernel.org>
 <18c80d15e30.279b.9b12b7fc0a3841636cfb5e919b41b954@broadcom.com>
 <1b51997f-2994-46e8-ac58-90106d1c486d@marcan.st>
From: Arend van Spriel <arend.vanspriel@broadcom.com>
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In-Reply-To: <1b51997f-2994-46e8-ac58-90106d1c486d@marcan.st>
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On 12/19/2023 12:01 PM, Hector Martin wrote:
> 
> 
> On 2023/12/19 17:52, Arend Van Spriel wrote:
>> On December 17, 2023 12:25:23 PM Kalle Valo <kvalo@kernel.org> wrote:
>>
>>> Hector Martin <marcan@marcan.st> wrote:
>>>
>>>> Using the WSEC command instead of sae_password seems to be the supported
>>>> mechanism on newer firmware, and also how the brcmdhd driver does it.
>>>>
>>>> According to user reports [1], the sae_password codepath doesn't actually
>>>> work on machines with Cypress chips anyway, so no harm in removing it.
>>>>
>>>> This makes WPA3 work with iwd, or with wpa_supplicant pending a support
>>>> patchset [2].
>>>>
>>>> [1] https://rachelbythebay.com/w/2023/11/06/wpa3/
>>>> [2] http://lists.infradead.org/pipermail/hostap/2023-July/041653.html
>>>>
>>>> Signed-off-by: Hector Martin <marcan@marcan.st>
>>>> Reviewed-by: Neal Gompa <neal@gompa.dev>
>>>
>>> Arend, what do you think?
>>>
>>> We recently talked about people testing brcmfmac patches, has anyone else
>>> tested this?
>>
>> Not sure I already replied so maybe I am repeating myself. I would prefer
>> to keep the Cypress sae_password path as well although it reportedly does
>> not work. The vendor support in the driver can be used to accommodate for
>> that. The other option would be to have people with Cypress chipset test
>> this patch. If that works for both we can consider dropping the
>> sae_password path.
>>
>> Regards,
>> Arend
> 
> So, if nobody from Cypress chimes in ever, and nobody cares nor tests
> Cypress chipsets, are we keeping any and all existing Cypress code-paths
> as bitrotting code forever and adding gratuitous conditionals every time
> any functionality needs to change "just in case it breaks Cypress" even
> though it has been tested compatible on Broadcom chipsets/firmware?
> 
> Because that's not sustainable long term.

You should look into WEXT just for the fun of it. If it were up to me 
and a bunch of other people that would have been gone decades ago. Maybe 
a bad example if the sae_password is indeed not working, but the Cypress 
chipset is used in RPi3 and RPi4 so there must be a couple of users.

Regards,
Arend

Regards,
Arend

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