Question: ath10k and tcpdump antenna noise information missing

[Tomasz Skapski]

Hi Tomi,

you can scan only on given frequencies using iw:

iw dev <devname> scan [-u] [freq <freq>*] [ies <hex as 00:11:..>]
[ssid <ssid>*|passive]
Scan on the given frequencies and probe for the given SSIDs
(or wildcard if not given) unless passive scanning is requested.
If -u is specified print unknown data in the scan results.
Specified (vendor) IEs must be well-formed.

It should speed up your script.

Regards,
Tomasz Skąpski


On 3 November 2015 at 07:45, Tomi Saarnio <Tomi.Saarnio at ekahau.com> wrote:
> Hi all,
>
> More information on this. When I run the following bash script, the iw survey dump returns channel noise value,
> but I have no idea whether this value would be identical to the "antenna noise" that the tcpdump should return.
>
> while [ 1 ]
> do
>   iwlist wlan0 scan > /dev/null
>   reset
>   iw wlan0 survey dump | grep "noise"
> done
>
> And, running the iwlist scan + iw survey dump is v-e-r-y s-l-o-w as it scans all the channels supported, where as
> the tcpdump will return the antenna noise only on the specific channel we are monitoring.
>
> Any suggestions?
>
> Best regards,
> Tomi Saarnio
>
> ________________________________________
> From: ath10k <ath10k-bounces at lists.infradead.org> on behalf of Tomi Saarnio <Tomi.Saarnio at ekahau.com>
> Sent: Monday, November 2, 2015 1:27 PM
> To: ath10k at lists.infradead.org
> Subject: Question: ath10k and tcpdump antenna noise information missing
>
> Hi,
>
> I have been trying to figure out how to get the antenna noise information from the tcpdump.
> So far, no luck.
>
> The purpose is to estimate the channel noise level and quality using the antenna signal level
> (which is available in the tcpdump already) and the antenna noise level (the missing piece of
> the puzzle).
>
> For example:
>
> # tcpdump -ni wlan0 -c 10 2> /dev/null
>
>  [63933.453161] device wlan0 entered promiscuous mode
> 15:22:43.038447 1.0 Mb/s 2412 MHz[63934.205367] device wlan0 left promiscuous mode
>  11b -60dB signal antenna 0 Beacon (NM-WLAN2) [1.0* 2.0* 5.5* 11.0* 9.0 18.0 36.0 54.0 Mbit] ESS CH: 1, PRIVACY
> 15:22:43.038853 11.0 Mb/s 2412 MHz 11b -31dB signal antenna 0 Probe Response (aaaa) [9.0 11.0* 12.0 18.0 24.0 36.0 48.0 54.0 Mbit] CH: 1, PRIVACY
> 15:22:43.039077 5421223us tsft 11.0 Mb/s 2412 MHz 11b -38dB signal antenna 0 Acknowledgment RA:00:19:07:c5:58:11
> 15:22:43.039469 11.0 Mb/s 2412 MHz 11b -31dB signal antenna 0 Probe Response (bbbb) [9.0 11.0* 12.0 18.0 24.0 36.0 48.0 54.0 Mbit] CH: 1, PRIVACY
> 15:22:43.039694 5421839us tsft 11.0 Mb/s 2412 MHz 11b -39dB signal antenna 0 Acknowledgment RA:00:19:07:c5:58:1e
> 15:22:43.040062 11.0 Mb/s 2412 MHz 11b -31dB signal antenna 0 Beacon (cccc) [9.0 11.0* 12.0 18.0 24.0 36.0 48.0 54.0 Mbit] ESS CH: 1, PRIVACY
> 15:22:43.040298 5422447us tsft 11.0 Mb/s 2412 MHz 11b -31dB signal antenna 0 Clear-To-Send RA:00:19:07:c5:58:1e
> 15:22:43.040580 5421593us tsft 11.0 Mb/s 2412 MHz 11b -31dB signal antenna 0 CF +QoS Data IV:4d23 Pad 20 KeyID 0
> 15:22:43.040659 5422747us tsft 5.5 Mb/s 2412 MHz 11b -38dB signal antenna 0 Acknowledgment RA:00:19:07:c5:58:1e
> 15:22:43.043266 5425416us tsft 11.0 Mb/s 2412 MHz 11b -28dB signal antenna 0 Clear-To-Send RA:00:19:07:c5:58:1e
>
> (Note: it seems that the board didn't enter the promiscous mode, but apparently the tcpdump
> captures data successfully.)
>
> The platform is Gateworks Ventana board with the latest kernel 4 build and WLE600VX Ath10k miniPCIe board.
> "Linux OpenWrt 4.1.6 #2 SMP Thu Oct 29 15:18:59 EET 2015 armv7l GNU/Linux"
>  The ath10k firmware version is firmware-2.bin_10.1.467.2-1, but I have also tried firmware-5.bin_10.2.4.70.10-2.
>
> Questions:
>
> - Does the current athk10k firmware and/or driver support the antenna noise information?
> - If the current driver doesn't support the feature yet, any plans when it would be available?
> - If the current driver does provide the missing information, how can I get it to the tcpdump capture?
> - Is there any other ways of obtaining the same information by not using tcpdump?
>
> Any pointers and suggestions greatly appreciated.
>
> Best regards,
> Tomi Saarnio
>
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