Re: Bug#645055: realtek 8188CE ad-hoc mode not supported

[Ben Hutchings <ben@decadent.org.uk>]

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On Wed, 2011-10-12 at 21:10 -0500, Larry Finger wrote:
> On 10/12/2011 06:24 PM, Ben Hutchings wrote:
> > I looked a little further and saw that nl80211 does support changing
> > interface type (mode).  But this driver (rtl8192ce) only supports
> > creating new interfaces, not changing their type.
> >
> > Should mac80211 drivers generally support changing interface type
> > (change_interface operation)?
> 
> I don't think that implementation of the WEXT interface is necessary.

The change_interface operation appears to be used in implementation of
nl80211 too.

> As to using iw, the following sequence worked:
> 
> iw dev wlan14 interface add wlan15 type adhoc
> iw dev  set rename5 type managed
> iw dev  set rename5 type adhoc
> 
> Why it was called "rename5" when I asked for "wlan15" is not understood,

udev's persistent name generator isn't able to distinguish the two
interfaces by MAC address, so it decides the new interface should also
be named 'wlan14'.  udev does renaming in two steps for some reason, and
the second step obviously fails.

> but the 
> iw interface changes the mode for an existing interface when using rtl8192ce.
> 
> BTW, I added a new iface because I did not want to interrupt my
> internat connection.

Hmm.  Maybe the change_interface operation is only needed to change
type/mode while the interface is up.

Antoine, did you bring the interface down before setting its mode?

Ben.

-- 
Ben Hutchings
Quantity is no substitute for quality, but it's the only one we've got.

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