[PATCH v3] ath10k: support get/set antenna configurations.

[Yeoh Chun-Yeow]

I also try to confirm using debug_mask in ath10k and it seems also 3
spatial streams:
[ 3826.320000] ath10k: rx skb 86533480 len 1534 vht80 rate_idx 7
vht_nss 3 freq 5180 band 1 flag 0x40600000 fcs-err 0mic-err 0

-----
Chun-Yeow

On Wed, May 14, 2014 at 3:22 PM, Yeoh Chun-Yeow <yeohchunyeow at gmail.com> wrote:
> Here is the screenshot of my wireshark capture. I am seeing 3 spatial
> streams instead of 1 after setting the antennas.
>
> ---
> Chun-Yeow
>
> On Wed, May 14, 2014 at 3:18 PM, Avery Pennarun <apenwarr at gmail.com> wrote:
>> On Wed, May 14, 2014 at 2:25 AM, Yeoh Chun-Yeow <yeohchunyeow at gmail.com> wrote:
>>> Here is from the fw_stats:
>>>
>>>              ath10k PEER stats (1)
>>>              =================
>>>
>>>               Peer MAC address 04:f0:21:0c:a5:1c
>>>                      Peer RSSI 43
>>>                   Peer TX rate 877500
>>>                   Peer RX rate 877500
>>>
>>> TCP throughput is roughly around 151Mbps.
>>
>> In my tests it's easy to achieve >151 Mbps with a 40 MHz channel and
>> 2x2.  So if you're using an 80 MHz channel (twice the speed) and only
>> one antenna (half the speed) you could still get 151 Mbps pretty
>> easily.
>>
>> I wouldn't be surprised if your speed is being limited by something
>> else, maybe the host CPU or a slow interconnect on the station or AP
>> (USB perhaps?), so it doesn't look "worse" with only one antenna
>> because it should be at least twice as good when operating normally.
>>
>> If you use wireshark or tcpdump you should be able to check the MCS
>> level of the packets and see that it's lower with fewer antennas.
>>
>> Have fun,
>>
>> Avery