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Subject: Re: [PATCHv2 1/2] nl80211: vendor-cmd: qca: add command for ap power
 save
From:   Arend Van Spriel <arend.vanspriel@broadcom.com>
To:     Kalle Valo <kvalo@codeaurora.org>, vnaralas@codeaurora.org
Cc:     Johannes Berg <johannes@sipsolutions.net>,
        linux-wireless@vger.kernel.org, ath11k@lists.infradead.org
References: <1598257589-19091-1-git-send-email-vnaralas@codeaurora.org>
 <4b4a0d79a243c1c3b8044730da0493c96ba294bf.camel@sipsolutions.net>
 <871rilf2th.fsf@codeaurora.org>
 <dbaa655c3f15f800f73b7c19f2b1a054@codeaurora.org>
 <87eelr1oq9.fsf@codeaurora.org>
 <f6c148a3-73de-1481-5f63-2deecb599468@broadcom.com>
Message-ID: <a5a31d7e-343f-1381-37b8-e1ef2c977e8d@broadcom.com>
Date:   Thu, 22 Oct 2020 10:05:30 +0200
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On 10/22/2020 10:00 AM, Arend Van Spriel wrote:
> On 10/21/2020 7:19 PM, Kalle Valo wrote:
>> vnaralas@codeaurora.org writes:
>>
>>> On 2020-09-29 13:10, Kalle Valo wrote:
>>>> Johannes Berg <johannes@sipsolutions.net> writes:
>>>>
>>>>> On Mon, 2020-08-24 at 13:56 +0530, Venkateswara Naralasetty wrote:
>>>>>> AP power save feature is to save power in AP mode, where AP goes
>>>>>> to power save mode when no stations associate to it and comes out
>>>>>> of power save when any station associate to AP.
>>>>>
>>>>> Why do you think this requires a vendor command? I mean, that seems
>>>>> like
>>>>> fairly reasonable - even by default - behaviour?
>>>>
>>>> I have not studied the details, but doesn't AP power save break normal
>>>> functionality? For example, I would guess probe requests from clients
>>>> would be lost. So there's a major drawback when enabling this, right?
>>>
>>> This AP power save feature will not break any functionality, Since one
>>> chain is always active and all other chains will be disabled when this
>>> feature is enabled. AP can still be able to beacon and receive probe
>>> request from the clients. The only drawback is reduced network range
>>> when this feature is enabled. Hence, we don't want to enable it by
>>> default.
>>
>> Yeah, we really would not want to enable that by default. But what
>> should be the path forward, a vendor command or a proper nl80211
>> command? Any opinions?
> 
> I would go for a proper nl80211 command or just add an attribute for use 
> in NL80211_CMD_START_AP or deal with NL80211_CMD_SET_POWERSAVE when 
> operating in AP mode.

At first I though this functionality was same as SMPS which is in the 
802.11 spec, but reading up on it that seems to be a STA feature.

Regards,
Arend

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