Re: 9984 VHT

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

Am 02.02.2017 um 20:05 schrieb Ben Greear:
> On 02/02/2017 10:42 AM, Sebastian Gottschall wrote:
>> 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
>
> Well it would have been helpful from the start to have known about 
> this patch.
i wasnt sure about it at that time. since it did not work
>
> Could you post it?
--- wmi.c       (revision 3267)
+++ wmi.c       (working copy)
@@ -1637,11 +1637,12 @@
                 flags |= WMI_CHAN_FLAG_DFS;

         ch->mhz = __cpu_to_le32(arg->freq);
+       ch->band_center_freq2 = 0;
         ch->band_center_freq1 = __cpu_to_le32(arg->band_center_freq1);
         if (arg->mode == MODE_11AC_VHT80_80)
                 ch->band_center_freq2 = 
__cpu_to_le32(arg->band_center_freq2);
-       else
-               ch->band_center_freq2 = 0;
+       if (arg->mode == MODE_11AC_VHT160)
+               ch->band_center_freq2 = 
__cpu_to_le32(arg->band_center_freq1);
         ch->min_power = arg->min_power;
         ch->max_power = arg->max_power;
         ch->reg_power = arg->max_reg_power;

>
> Kalle:  Since the firmware API changed, how do you want to handle the 
> differences here?
>
> Thanks,
> Ben
>
>


-- 
Mit freundlichen Grüssen / Regards

Sebastian Gottschall / CTO

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