Re: 9984 VHT

[Sebastian Gottschall <s.gottschall@dd-wrt.com>]

Am 02.02.2017 um 19:24 schrieb Ben Greear:
> On 02/02/2017 08:18 AM, Ben Greear wrote:
>> On 02/01/2017 10:45 AM, Sebastian Gottschall wrote:
>>> Am 01.02.2017 um 17:48 schrieb Ben Greear:
>>>> On 01/30/2017 02:28 AM, Sebastian Gottschall wrote:
>>>>> Hello
>>>>>
>>>>> with recent 9984 firmares vht160 seem to crash the firmware itself 
>>>>> for no reason i see.
>>>>> is there any internal structure change in these newer firmwares we 
>>>>> need to consider?
>>>>> i also tested the even more recent firmware 
>>>>> firmware-5.bin_10.4-3.4-00068 from codeaurora. this one doesnt 
>>>>> crash but the vdev_start returns with a error
>>>>>
>>>>> i compared the more recent wmi headers from the qca drivers, but 
>>>>> wasnt able to find anything which could explain the behaviour
>>>>>
>>>>> Sebastian
>>>>>
>>>>>
>>>>
>>>> Hello Sebastian,
>>>>
>>>> Could you share the hostapd/supplicant config file you are using?
>>>>
>>>> And, what kernel (or backports kernel) are you using?  I'd like to
>>>> see how 160Mhz works on my firmware....
>>> always state of art for sure
>>
>> Using a somewhat hacked 4.9.2+ kernel and my CT firmware, I get 
>> failure to start CAC:
>>
>> 1486052184.818710: Mode: IEEE 802.11a  Channel: 100  Frequency: 5500 MHz
>> 1486052184.818714: DFS 8 channels required radar detection
>> 1486052184.818717: DFS all channels available, (SKIP CAC): no
>> 1486052184.818719: DFS 0 chans unavailable - choose other channel: no
>> 1486052184.818722: vap0: interface state COUNTRY_UPDATE->DFS
>> 1486052184.818725: DFS start CAC on 5500 MHz
>> 1486052184.818733: vap0: DFS-CAC-START freq=5500 chan=100 sec_chan=1, 
>> width=2, seg0=114, seg1=0, cac_time=60s
>> 1486052184.818737: nl80211: Start radar detection (CAC) 5500 MHz 
>> (ht_enabled=1, vht_enabled=1, bandwidth=160 MHz, cf1=5570 MHz, cf2=0 
>> MHz)
>> 1486052184.818742:   * freq=5500
>> 1486052184.818745:   * vht_enabled=1
>> 1486052184.818747:   * ht_enabled=1
>> 1486052184.818749:   * bandwidth=160
>> 1486052184.818751:   * channel_width=5
>> 1486052184.818754:   * center_freq1=5570
>> 1486052184.818756:   * center_freq2=0
>> 1486052184.823437: nl80211: Failed to start radar detection: -16 
>> (Device or resource busy)
>> 1486052184.823444: DFS start_dfs_cac() failed, -1
>>
>>
>> I'll go dig around to see if I can figure out why...
>
> I hacked ath10k to enable radar detection on 160Mhz bandwidths. Now 
> hostapd
> starts.
>
> I can reproduce the FW failure.  It is because FW 3.3-25 release 
> started asserting
> if the freq2 was zero in VHT160 mode.  It seems to use both freq1 and 
> freq2, and not
> how the driver or linux seems to normally use them.
its even worse. starting from 3.3 it uses freq2 instead of freq1. but i 
made a patch for it. but it still wont work. vdev_start still fails
>
> I think I will back out the firmware changes in my FW, if driver ever 
> wants to be compat
> with both it is going to have to have nasty hacks I suppose.
>
> If you have recent 10.4 FW source, look for 
> convert_160MHz_single_center_freq_to_two_center_freq
> and compare it to older FW versions.
i dont have a recent source, but the qca driver source which allows me 
to see how its called

>
> Thanks,
> Ben
>
>>
>> Thanks,
>> Ben
>>
>>
>
>


-- 
Mit freundlichen Grüssen / Regards

Sebastian Gottschall / CTO

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