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Re: [PATCH] cfg80211: restrict AP beacon intervals

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On Thu, 2011-05-12 at 20:08 +0200, BjÃrn Smedman wrote:

> > That has a failure path, and recently I posted a patch to advertise the
> > interface type combinations. I don't think MAC addresses impose any sort
> > of restriction.
> 
> I think at least some rt2x00 hw may not be able to handle all
> combinations of multi-vif MAC addresses.
> 
> If I understand correctly ath9k will happily configure the hardware to
> ack all BSSIDs if multi-vif MAC addresses are poorly chosen. I don't
> know if that's a reason to fail but it wouldn't be good, right?

That'd be possible I guess if you configure them so their XOR is all
ones, but it doesn't matter -- you can fail that right now. Also, if the
user configures it like that maybe that's their fault?

> Another case where cross-vif constraints are difficult to handle is
> BSS_CHANGED_ERP_SLOT / BSS_CHANGED_ERP_PREAMBLE. Again, I'm not sure
> failing is the right way to handle this but at least ath9k seems
> incapable of having separate slot times / preambles for separate
> vifs...

That's hard to believe since it's rate control stuff?

johannes

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