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Re: [PATCH] cfg80211: restrict AP beacon intervals

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On Mon, May 9, 2011 at 6:49 PM, Johannes Berg <johannes@xxxxxxxxxxxxxxxx> wrote:
> On Mon, 2011-05-09 at 09:46 -0700, Ben Greear wrote:
>> On 05/09/2011 09:41 AM, Johannes Berg wrote:
>> > From: Johannes Berg<johannes.berg@xxxxxxxxx>
>> >
>> > Multiple virtual AP interfaces can currently try
>> > to use different beacon intervals, but that just
>> > leads to problems since it won't actually be done
>> > that way by drivers. Return an error in this case
>> > to make sure it won't be done wrong.
>>
>> I think there is no problem with having different beacon
>> intervals, as long as they are all a multiple of
>> the smallest interval and the driver does things properly.
>>
>> I'm not sure ath9k or ath5k currently supports this properly,
>> but there was a patch floating around for a while that did
>> this for ath9k I think...
>
> Yes, in theory that's possible, but apparently no driver actually did
> this correctly. Also, it didn't seem like anyone really cares, and we
> need to enforce some restrictions because otherwise drivers will end up
> doing it wrong, and you'll end up having a beacon interval of 200 while
> advertising 150 for example, which will totally throw off powersaving
> clients.

I'm very interested in having multiple AP vifs with different beacon
intervals. If we're going to just fail anyway in this case can't we do
that from the drivers instead? I would also prefer that from an
aesthetic point of view, instead of having broken logic in the drivers
"protected" by extra verification in cfg80211.

Best regards,

Björn
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