[PATCH 00/20] wpa_s: p2p: support nl80211 P2P_DEVICE interface

Arend van Spriel arend at broadcom.com
Wed May 22 12:13:44 EDT 2013

On 05/22/2013 04:08 PM, Johannes Berg wrote:
> On Wed, 2013-05-22 at 16:03 +0200, Arend van Spriel wrote:
>> On 05/21/2013 02:02 PM, Jouni Malinen wrote:
>>> On Tue, May 21, 2013 at 01:53:38PM +0200, Arend van Spriel wrote:
>>>> On 05/19/2013 09:08 PM, Jouni Malinen wrote:
>>>>> Thanks. I started applying commits, but had to stop with that pretty
>>>>> quickly since this broke number of things in my tests (including hostapd
>>>>> build and wpa_supplicant start).. I think I managed to fix most of the
>>>>> issues, but this still does not work in my hwsim tests.
>>>> Can you elaborate what does not work in you hwsim tests. I tested
>>>> with your devel branch and I can connect and ping. However, I am
>>>> using 3.10-rc1 on the peer using P2P Device interface. Reason for
>>>> this is that it needs a nl80211 patch to make P2P_FIND succeed.
>>> I did not see device discovery working. hwsim0 shows Probe Request
>>> frames, but there was no reporting if Probe Request frames to
>>> wpa_supplicant and as such, no responses to these.
>>>>     commit 97990a060e6757f48b931a3946b17c1c4362c3fb
>>>>     Author: Johannes Berg <johannes.berg at intel.com>
>>>>     Date:   Fri Apr 19 01:02:55 2013 +0200
>>>>         nl80211: allow using wdev identifiers to get scan results
>>> I'd assume I had that in my tests. I was using a wireless-testing.git
>>> snapshot. Anyway, whether I had that there or not does not matter since
>>> there is obviously at least one snapshot of the kernel where this breaks
>>> P2P completely at least for hwsim tests. I cannot apply such changes
>>> into hostap.git without protection that avoids regressions with any past
>>> kernel snapshot in the default configuration. It would be unfortunate if
>>> we have managed to push kernel changes in to claim support for this
>>> without it actually working. That would mean that there may be need for
>>> manual configuration to enable this in wpa_supplicant and/or a new
>>> capability bit in the kernel once things start working.
>>>> Another thing is that for P2P Device I use the same configuration
>>>> file, but that starts scanning on P2P Device for the networks
>>>> configured in it. So I patched wpa_supplicant_enabled_networks() to
>>>> return 0 if wpa_s->p2p_mgmt is 1.
>>> Hmm.. I don't think this would explain the issues I saw.
>> The issue you saw were that pcap dump shows only probe requests, right?
>> I ran hwsim tests or actually the tests in test_p2p_discovery.py and
>> used cfg80211 tracing. It seems mac80211 only calls cfg80211_rx_mgmt()
>> for wdev(1) and returns false as it is not registered for that. The P2P
>> Device interface is wdev(2). I am not that familiar with mac80211 rx
>> path, but probe request register seems to succeed for wdev(2). The
>> function __ieee80211_rx_handle_packet() seems to feed the frame to the
>> virtual interfaces.
>> Johannes, do you have any clues here? I think this is the issue that
>> David saw when using my patch fixing registration of probe requests as
>> that failed for him (using a mac80211 driver).
> Do you have
> http://git.kernel.org/cgit/linux/kernel/git/linville/wireless.git/commit/?id=1b737f88dc1b05cf571e96d42f748aaff6df1eb5

I have not. Thanks.

Gr. AvS

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