Cannot use 80MHz channel

Cannot use 80MHz channel

[Li Sun]

Hi,

I am trying to play around with the ath10k driver. I have two Qualcomm
Atheros QCA9880 Version 2 802.11ac chipsets. I put one of the cards in
AP mode using hostapd and connect the other one as a client.

I am using the hostapd config mentioned at
"wireless.kernel.org/en/users/Drivers/ath10k/configuration". The
client connects but the throughput is just around 300 Mbps (suggesting
40 MHz channel-width) and NOT any higher. It seems I am unable to use
the 80 MHz channel-width. Also, when I checked the kernel logs
(dmesg), I found the following message on the client side only:

capabilities/regulatory prevented using AP HT/VHT configuration, downgraded


Could this problem be related to CRDA ? I am in the US.

I am using the following config to build the driver:

kernel 3.6.3-030603-generic

ath:
commit 915da50d3e13e2ad5518b43dcb8681
90d3811bc9
Merge: 8250e5b 5474efe
Author: Kalle Valo
Date:   Thu Oct 24 08:43:47 2013 +0300


backport tree:
commit db67a3f06e3cbd0ac2196f7373e5e927fc1a866f
Author: Luis R. Rodriguez
Date:   Tue Aug 27 18:04:25 2013 -0700


FrameAggregator

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Re: Cannot use 80MHz channel

[Michal Kazior]

On 17 December 2013 22:51, Li Sun <lsun3@buffalo.edu> wrote:
> Hi,
>
> I am trying to play around with the ath10k driver. I have two Qualcomm
> Atheros QCA9880 Version 2 802.11ac chipsets. I put one of the cards in
> AP mode using hostapd and connect the other one as a client.
>
> I am using the hostapd config mentioned at
> "wireless.kernel.org/en/users/Drivers/ath10k/configuration". The
> client connects but the throughput is just around 300 Mbps (suggesting
> 40 MHz channel-width) and NOT any higher. It seems I am unable to use
> the 80 MHz channel-width. Also, when I checked the kernel logs
> (dmesg), I found the following message on the client side only:
>
> capabilities/regulatory prevented using AP HT/VHT configuration, downgraded
>
>
> Could this problem be related to CRDA ? I am in the US.

Check output of `iw reg get`. If you see no entries with `@ 80` you
have to upgrade your regdb.


Michał

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Re: Cannot use 80MHz channel

[Kalle Valo]

Michal Kazior <michal.kazior@tieto.com> writes:

> On 17 December 2013 22:51, Li Sun <lsun3@buffalo.edu> wrote:
>> Hi,
>>
>> I am trying to play around with the ath10k driver. I have two Qualcomm
>> Atheros QCA9880 Version 2 802.11ac chipsets. I put one of the cards in
>> AP mode using hostapd and connect the other one as a client.
>>
>> I am using the hostapd config mentioned at
>> "wireless.kernel.org/en/users/Drivers/ath10k/configuration". The
>> client connects but the throughput is just around 300 Mbps (suggesting
>> 40 MHz channel-width) and NOT any higher. It seems I am unable to use
>> the 80 MHz channel-width. Also, when I checked the kernel logs
>> (dmesg), I found the following message on the client side only:
>>
>> capabilities/regulatory prevented using AP HT/VHT configuration, downgraded
>>
>>
>> Could this problem be related to CRDA ? I am in the US.
>
> Check output of `iw reg get`. If you see no entries with `@ 80` you
> have to upgrade your regdb.

And the easiest way to do that (if you compile your own kernels) is to
enable CONFIG_CFG80211_INTERNAL_REGDB and copy db.txt from
wireless-regdb to net/wireless/db.txt.

-- 
Kalle Valo

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