AdHoc (IBSS) on Nexus 7 (2013) connecting to one node only

Fri Oct 17 07:28:12 PDT 2014

>'struct ieee80211_rx_status' has no member named 'vendor_radiotap_len'
This looks like you are using wrong mac80211 driver.

> All the other modules are compiled, but it is as if the build ignores
wcn36xx completely.

When you use backports it will change your makefile so instead of
using CONFIG_WCN36XX it will rename it to something like
CPTCFG_WCN36XX therefore build system will skip building driver.

2014-10-15 20:04 GMT+01:00 Jaco Joubert <jdjoubert at gmail.com>:
> Eugene,
>
> I eventually gave this a try.
> I obviously need to adapt the steps a bit for deb.  I am currently
> running into a problem compiling wcn36xx and I'm not sure if I'm maybe
> doing something wrong.  I hope you can direct me a bit..
>
> I followed the steps to compile CyanogenMod and then configuring its
> kernel to disable the prima driver and allow for kernel modules.
> Although I haven't flashed my device with that version yet, it looks
> like it builds fine.
>
> I then followed the steps to compile wcn36xx.
>
> 1.  The instructions refer specifically to the 'next-20131122' tag.
> I'm not sure if that is a strict requirement, or if it was only the
> latest at the time of writing.. In the current linux-next repository,
> I can't find a tag like that (next-20131122).  What I did was to look
> at the latest 'refresh' on backports, which in my case is commit
> ed7bd06 ("backports: refresh patches on next-20140905").  I therefore
> ran gentree referring to that tag (next-20140905).  (On a side-note..
> I had to make a small fix in gentree to parse the result from git
> ls-tree correctly.. with my git version, the file portion is not
> tab-separated from the meta-data, but just space-separated).
>
> 2.  The instructions then indicate that I should link in the wcn36xx
> code into backport-wcn, but in my case there is already a wcn36xx
> directory in backport-wcn after I ran gentree
> (drivers/net/wireless/ath/wcn36xx/).  I tried two approaches:
>
> 2.1.  Leave the one resulting from gentree as-is.  If I build with
> this, I get the following error:
> ..../backport-wcn/drivers/net/wireless/ath/wcn36xx/txrx.c: In function
> 'wcn36xx_rx_skb':
> ..../backport-wcn/drivers/net/wireless/ath/wcn36xx/txrx.c:61:2: error:
> 'struct ieee80211_rx_status' has no member named 'vendor_radiotap_len'
>
> 2.2.  Remove the one resulting from gentree and replace it with a
> symlink to the latest source from the wcn36xx repo.  In this case,
> although the build runs through fine, it skips compiling wcn36xx.ko.
> All the other modules are compiled, but it is as if the build ignores
> wcn36xx completely.
>
> Could you please indicate if I'm missing something obvious?  I
> appreciate your time.
>
> Regards,
> Jaco
>
> On Sat, Aug 30, 2014 at 11:21 AM, Eugene Krasnikov <k.eugene.e at gmail.com> wrote:
>> The approach should be the same on both mako and deb. Just follow step
>> by step instructions on a wiki and that should work by default. If you
>> face any problems, we can try to sort that out and update wiki.
>>
>> 2014-08-28 8:49 GMT+01:00 Jaco Joubert <jdjoubert at gmail.com>:
>>> In the meantime I played a bit with CyanogenMod (which by the way does use
>>> the prima driver compiled as part of the kernel.. not a dynamic module).
>>> I experienced limited success for my specific requirement.  I sometimes have
>>> to re-configure the connection a couple of times before it sets up correctly
>>> and allow traffic to other ad-hoc nodes in range.  And when it does and
>>> there are multiple other nodes on the ad-hoc network, it only supports
>>> traffic to one (seems randomly chosen) node.
>>>
>>> While I'm trying to get to the bottom of why it (prima driver) is behaving
>>> like it is, I am also considering replacing the prima driver with wcn36xx as
>>> a test.  I unfortunately have limited experience in these sort of
>>> operations.  Are there any sort of guidelines I can follow to to this
>>> replacement, or am I completely on my own?  I can currently build
>>> CyanogenMod from source.  Basically need to rip out prima and replace with
>>> wcn36xx.  Also not sure if wcn36xx can/should be compiled as part of the
>>> kernel, or should it be a dynamically loaded module.
>>>
>>> The wcn36xx driver page has some instructions for doing this kind of thing
>>> for the "Mako" device on CM10.1
>>> (http://wireless.kernel.org/en/users/Drivers/wcn36xx#Mako_on_CM_10.1).  I am
>>> currently using the "deb" device on CM11 (M9).  I could attempt to roughly
>>> follow the Mako guide, but I just don't want to do that if I know up-front
>>> that my setup is too different.
>>>
>>> Any assistance would be greatly appreciated.
>>>
>>>
>>> On Wed, Jul 23, 2014 at 4:04 PM, YanBo <dreamfly281 at gmail.com> wrote:
>>>>
>>>> Hi Jaco,
>>>>
>>>> The Prima driver also not implemented the ADHOC support, but there are P2P
>>>> support in you may have a reference,
>>>> WCN36XX and prima are totally different in the driver architect (IE
>>>> WCN26XX use the wireless MAC80211 but Prima has it own 80211 stack)and
>>>> license, you need evaluation them based on your specify requirement.
>>>>
>>>> BR /Yanbo
>>>>
>>>>
>>>> On Wed, Jul 23, 2014 at 12:42 AM, Jaco Joubert <jdjoubert at gmail.com>
>>>> wrote:
>>>>>
>>>>> Thanks a lot for the responses.  I will investigate the prima driver as
>>>>> well.
>>>>>
>>>>> I suppose its not fair to ask for an opinion between the 2 drivers on
>>>>> this mailing list (wcn36xx vs prima), but maybe specifically related
>>>>> to the Nexus 7 2013 device and CyanogenMod..
>>>>> Should I rather try to get the prima driver behaving like I need, or
>>>>> should I try replacing the prima driver with the wcn36xx driver?
>>>>> Maybe someone has done this already for the specific device mentioned
>>>>> and can give feedback on the outcome?
>>>>>
>>>>> On Tue, Jul 22, 2014 at 5:11 PM, Kalle Valo <kvalo at qca.qualcomm.com>
>>>>> wrote:
>>>>> > Jaco Joubert <jdjoubert at gmail.com> writes:
>>>>> >
>>>>> >> Apologies for my limited knowledge on this, but I'm not 100% sure!
>>>>> >>
>>>>> >> root at deb:/ # ls /sys/module/ | grep -E 'wcn|prima'
>>>>> >> wcnss_ssr_8960
>>>>> >> wcnsscore
>>>>> >>
>>>>> >> Does this mean wcn36xx?  Or how can I check?
>>>>> >
>>>>> > You should see wcn36xx module loaded. AFAIK CyanogenMod uses the prima
>>>>> > driver and if you didn't compile wcn36xx yourself, you are most likely
>>>>> > using the prima driver. And that driver is out of scope in this mailing
>>>>> > list.
>>>>> >
>>>>> > --
>>>>> > Kalle Valo
>>>>>
>>>>> _______________________________________________
>>>>> wcn36xx mailing list
>>>>> wcn36xx at lists.infradead.org
>>>>> http://lists.infradead.org/mailman/listinfo/wcn36xx
>>>>
>>>>
>>>
>>
>>
>>
>> --
>> Best regards,
>> Eugene

-- 
Best regards,
Eugene