ath10k: Fix reported HT MCS rates with NSS > 1

[Sebastian Gottschall]

the assumption made in this patch is obviously wrong (at least for more 
recent firmwares and 9984)
my log is flooded with messages like
[208802.803537] ath10k_pci 0001:03:00.0: Invalid VHT mcs 15 peer stats
[208805.108515] ath10k_pci 0001:03:00.0: Invalid VHT mcs 15 peer stats
[208821.747621] ath10k_pci 0001:03:00.0: Invalid VHT mcs 15 peer stats
[208822.516599] ath10k_pci 0001:03:00.0: Invalid VHT mcs 15 peer stats
[208841.257780] ath10k_pci 0001:03:00.0: Invalid VHT mcs 15 peer stats


i tested this with the 10.4.3.5-0038 firmware which isnt official 
published but made from athwlan.bin i got from qca chipcode

Am 23.05.2017 um 17:28 schrieb Kalle Valo:
> Sven Eckelmann <sven.eckelmann at openmesh.com> wrote:
>> The QCA4019 firmware 10.4-3.2.1-00050 reports only HT MCS rates between
>> 0-9. But 802.11n MCS rates can be larger than that. For example a 2x2
>> device can send with up to MCS 15.
>>
>> The firmware encodes the higher MCS rates using the NSS field. The actual
>> calculation is not documented by QCA but it seems like the NSS field can be
>> mapped for HT rates to following MCS offsets:
>>
>>   * NSS 1: 0
>>   * NSS 2: 8
>>   * NSS 3: 16
>>   * NSS 4: 24
>>
>> This offset therefore has to be added for HT rates before they are stored
>> in the rate_info struct.
>>
>> Fixes: cec17c382140 ("ath10k: add per peer htt tx stats support for 10.4")
>> Signed-off-by: Sven Eckelmann <sven.eckelmann at openmesh.com>
> Patch applied to ath-next branch of ath.git, thanks.
>
> c1dd8016ae02 ath10k: fix reported HT MCS rates with NSS > 1
>

-- 
Mit freundlichen Grüssen / Regards

Sebastian Gottschall / CTO

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