P2P Device support: how to deal with p2p_no_group_iface option

Arend van Spriel arend at broadcom.com
Mon May 27 15:20:21 EDT 2013

On 05/27/2013 09:15 PM, Johannes Berg wrote:
> On Mon, 2013-05-27 at 21:11 +0300, Jouni Malinen wrote:
>> On Mon, May 27, 2013 at 03:56:19PM +0200, Arend van Spriel wrote:
>>> In this mac80211_hwsim is a special case. We could make P2P_DEVICE
>>> support in mac80211_hwsim optional using module parameter to allow
>>> testing both cases.
>> Yes, that would be helpful. I don't understand why my test setup moves
>> to using P2P Device by default when mac80211_hwsim is perfectly capable
>> of operating without that.. [...]
>> In general, I don't think it is a good idea to change existing behavior
>> with a kernel or wpa_supplicant upgrade. It is obviously fine if this is
>> needed for the functionality to work in the first place, but that is not
>> the case with mac80211_hwsim.
> It's kinda a side effect of having "I support P2P-Device" also mean "I
> want P2P-Device to be used", but for everything other than hwsim that
> seems like the only reasonable choice, so ... I wouldn't mind changing
> the default in hwsim though to not support/desire P2P-Device w/o a
> configuration option or so.

Hi Johannes,

Marcel suggested a different approach that sounds pretty compelling from 
a test perspective. However, that does change mac80211_hwsim behaviour 
more significantly. No pain, no gain :-)


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