Scanning all 5Ghz channels with AC NIC.

Ben Greear greearb at candelatech.com
Mon Mar 24 15:47:32 EDT 2014


On 03/24/2014 12:33 PM, Janusz Dziedzic wrote:
> On 24 March 2014 19:10, Ben Greear <greearb at candelatech.com> wrote:
>> I notice this issue while trying to scan specific channels with
>> an ath10k NIC.
>>
>> If I configure supplicant to use a specific freq list, it will fail:
>>
>> 1395683887.458813: nl80211: Scan frequency 5170 MHz
>> 1395683887.458823: nl80211: Scan frequency 5180 MHz
>> 1395683887.458829: nl80211: Scan frequency 5190 MHz
>> 1395683887.458834: nl80211: Scan frequency 5200 MHz
>> 1395683887.458840: nl80211: Scan frequency 5210 MHz
>> 1395683887.458845: nl80211: Scan frequency 5220 MHz
>> 1395683887.458850: nl80211: Scan frequency 5230 MHz
>> 1395683887.458855: nl80211: Scan frequency 5240 MHz
>> 1395683887.458861: nl80211: Scan frequency 5260 MHz
>> 1395683887.458866: nl80211: Scan frequency 5280 MHz
>> 1395683887.458871: nl80211: Scan frequency 5300 MHz
>> 1395683887.458876: nl80211: Scan frequency 5320 MHz
>> 1395683887.458881: nl80211: Scan frequency 5500 MHz
>> 1395683887.458886: nl80211: Scan frequency 5520 MHz
>> 1395683887.458890: nl80211: Scan frequency 5540 MHz
>> 1395683887.458895: nl80211: Scan frequency 5560 MHz
>> 1395683887.458900: nl80211: Scan frequency 5580 MHz
>> 1395683887.458905: nl80211: Scan frequency 5600 MHz
>> 1395683887.458911: nl80211: Scan frequency 5580 MHz
>> 1395683887.458916: nl80211: Scan frequency 5600 MHz
>> 1395683887.458921: nl80211: Scan frequency 5620 MHz
>> 1395683887.458926: nl80211: Scan frequency 5640 MHz
>> 1395683887.458931: nl80211: Scan frequency 5660 MHz
>> 1395683887.458936: nl80211: Scan frequency 5620 MHz
>> 1395683887.458942: nl80211: Scan frequency 5640 MHz
>> 1395683887.458947: nl80211: Scan frequency 5660 MHz
>> 1395683887.458952: nl80211: Scan frequency 5680 MHz
>> 1395683887.458957: nl80211: Scan frequency 5700 MHz
>> 1395683887.458962: nl80211: Scan frequency 5745 MHz
>> 1395683887.458987: nl80211: Scan frequency 5645 MHz
>> 1395683887.458996: nl80211: Scan frequency 5785 MHz
>> 1395683887.459001: nl80211: Scan frequency 5805 MHz
>> 1395683887.459005: nl80211: Scan frequency 5825 MHz
>> 1395683887.459040: nl80211: Scan trigger failed: ret=-22 (Invalid argument)
>>
>>
>> A standard scan seems to use only a subset of these channels.
>> But, wouldn't that make us miss scanning for some /a or /n APs
>> out there?
>>
>> [root at ct521-FCFC ~]# iw event
>> wlan0 (phy #1): scan started
>> wlan0 (phy #1): scan finished: 2412 2417 2422 2427 2432 2437 2442 2447 2452 2457 2462 5180 5200 5220 5240 5260 5280 5300 5320 5745 5765 5785 5805 5825, ""
>>
>>
>> Any idea if this is a bug in my config/assumptions, ath10k, or supplicant?
>>
> Strange, works quite good from iw:
> 
> janusz at dell:~$ sudo iw wlan1 scan freq 5180 5200 5220 5240 5260 5280
> 5300 5320 5745 5765 5785 5805 5825|grep freq
> janusz at dell:~$ sudo iw wlan1 scan freq 2412 2417 2422 2427 2432 2437
> 2442 2447 2452 2457 2462 5180 5200 5220 5240 5260 5280 5300 5320 5745
> 5765 5785 5805 5825|grep freq
>     freq: 2437
>     freq: 2427
>     freq: 2432
>     freq: 2452
>     freq: 2442
> janusz at dell:~$
> 
> Last hostap with config:
> network={
>     ssid="linksys"
>     psk="somepsk"
>     key_mgmt=WPA-PSK
>     disabled=1
>     scan_freq=2412 2417 2422 2427 2432 2437 2442 2447 2452 2457 2462
> 5180 5200 5220 5240 5260 5280 5300 5
> 320 5745 5765 5785 5805 5825
> }

Maybe my config is wrong...I was using freq_list instead of scan_freq,
and using it twice...

ctrl_interface=/var/run/wpa_supplicant
fast_reauth=1
scan_cur_freq=1
min_scan_gap=5
freq_list=5170 5180 5190 5200 5210 5220 5230 5240 5260 5280 5300 5320 5500 5520 5540 5560 5580 5600 5580 5600 5620 5640 5660 5620 5640 5660 5680 5700 5745 5645
5785 5805 5825

bss_max_count=2000
network={
    ssid="NETGEAR76-5G"
    disable_ht=0
    disable_vht=0
    disable_ht40=0
    disable_sgi=0
    ht_mcs=""
    disable_max_amsdu=-1
    ampdu_factor=-1
    ampdu_density=-1
    freq_list=5170 5180 5190 5200 5210 5220 5230 5240 5260 5280 5300 5320 5500 5520 5540 5560 5580 5600 5580 5600 5620 5640 5660 5620 5640 5660 5680 5700 5745
5645 5785 5805 5825

    key_mgmt=NONE
    proactive_key_caching=0

}


> 
> After enable_n 4:

How are you enabling n?


Thanks,
Ben

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



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