9984 VHT

[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.

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.

Thanks,
Ben

>
> Thanks,
> Ben
>
>


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