[PATCH] wpa_supplicant: support VHT capability overrides

[Ben Greear]

On 03/01/2013 09:56 AM, Johannes Berg wrote:
> On Fri, 2013-03-01 at 09:52 -0800, Ben Greear wrote:
>
>>> +# vht_rx_mcs_nss_1/2/3/4/5/6/7/8: override the MCS set for RX NSS 1-8
>>> +# vht_tx_mcs_nss_1/2/3/4/5/6/7/8: override the MCS set for TX NSS 1-8
>>> +#  0: MCS 0-7
>>> +#  1: MCS 0-8
>>> +#  2: MCS 0-9
>>> +#  3: not supported
>>
>> I'm confused by this.  The MCS overrides I put in for
>> HT basically allowed setting each bit in the available
>> MCS rates.  Can you offer a bit more explanation on what
>> these VHT MCS settings allow/do?
>
> I think if you knew how VHT MCSes worked, it'd be obvious :)

Well, yes, that is definitely my problem :)


> For VHT, there are 10 MCSes (0-9), each of which has up to
> configurations for the number of spatial streams (NSS). However, the VHT
> capabilities only allow supporting one of 0-7, 0-8, 0-9 or none (see
> also the example config file I included)
>
> So a device could, for example, support
>
> NSS 1: MCS 0-9
> NSS 2: MCS 0-9
> NSS 3-8: none
>
> You could override this, e.g. by setting
>
> vht_rx_mcs_nss_1=2
> vht_rx_mcs_nss_2=3
>
> and then you'd get
>
> NSS 1: MCS 0-8
> NSS 2-8: none

Ok, thanks.


Ben


-- 
Ben Greear <greearb at candelatech.com>
Candela Technologies Inc  http://www.candelatech.com