[rt2x00-users] 7 more packets after each beacon frame

[Ivo Van Doorn]

Hi,

On Mon, Nov 14, 2011 at 3:44 PM, Helmut Schaa
<helmut.schaa at googlemail.com> wrote:
> On Mon, Nov 14, 2011 at 3:38 PM, Ivo Van Doorn <ivdoorn at gmail.com> wrote:
>> Hi,
>>
>>>> Can't we just "program" the card with the right amount of BSSIDs as we
>>>> need them?
>>>> I.e. just set it to one at the start and change it later when more
>>>> BSSIDs are added.
>>>
>>> Sure, would be possible but if we remove an interface that might leave
>>> a hole in the beacon buffers. So, we would have to shift following
>>> beacons such that we don't have holes between any beacons ...
>>>
>>> I'm just thinking about a way to implement this without much management
>>> overhead.
>>
>> Another issue is that this solution will only reduce the number of extra
>> beacons. Basically you can program the driver to have:
>> 1, 2 or 8 beacons. So when you have 3 interfaces you will still have
>> the extra beacons. Furthermore you have to change both the BSSID and
>> unicode_to_me mask. And I am not sure if that will show any side effects.
>
> Hmm, not sure, we could just leave the MAC_BSSID_DW1_BSS_ID_MASK as "8"
> and just initialize MAC_BSSID_DW1_BSS_BCN_NUM  with the actual number of
> beaconing interfaces. I don't think the BSSID needs to have a specific value
> depending on the used beacon slot ...
>
> So, I think it is possible but quite some changes are required.

Yeah, especially since it means you have to constantly ensure that all enabled
beacons are placed right after each other in the registers.. I would
say that would
add a lot of complexity which we don't want. So can we detect which drivers are
broken and disable multi-BSSID for those?

Ivo