[rt2x00-users] running AP mode and sta/adhoc mode in parallel

Ivo Van Doorn ivdoorn at gmail.com
Mon Dec 19 22:41:46 EST 2011

On Mon, Dec 19, 2011 at 12:20 PM, Marek Lindner <lindner_marek at yahoo.de> wrote:
> On Monday, December 19, 2011 18:57:33 Ivo Van Doorn wrote:
>> > I guess the biggest issue is that the AP and STA mode interface have to
>> > share the hardware TSF timer. That means the STA mode interface cannot
>> > correctly sync up with the AP and as such wouldn't be able to implement
>> > power save functionality. Or the AP TSF timer would jump from time to
>> > time and this confuse its clients.
>> >
>> > Other then that I think it would be possible to do since the device can
>> > have up to 8 consecutive MACs. But this would need quite some effort in
>> > rt2x00.
> Do you believe this is a general hardware limitation of the ralink chipsets or
> does this affect some chips only ? I am asking because the ralink driver for
> the RT3052 claims to have support for AP and station mode at the same time.
> Although I never tested this configuration it made me believe it is generally
> possible.

In that case Ralink has to deliver some specifications on how this should
be made possible. But so far we never got such documentation, nor does
the driver which they released support it.

>> It can have multiple MACs, but you also have the BSSID field which for AP
>> mode must be initialized to the MAC address of the device, and in case
>> of STA to the
>> MAC address of the AP to which it is associated. So this would only be
>> possible when the STA is connected to itself which is rather ridiculous. ;)
> This BSSID field you are talking about is somewhere in the chip itself ?

It is a CSR register.


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