Switching channel in IBSS network doesn't work in ath9k

Switching channel in IBSS network doesn't work in ath9k

[Joerg Pommnitz]

Hello all,
I'm using the attached patch to form an IBSS network between two ath9k nodes:

IFACE=wlan0
FREQ=5200
ADDR=$1
iw dev "$IFACE" ibss leave
ip link set "$IFACE" down
ip addr flush dev "$IFACE"
iw dev "$IFACE" set type ibss
ip addr add "$ADDR"/24 dev "$IFACE"
ip link set "$IFACE" up
iw dev "$IFACE" ibss join athtest "$FREQ" fixed-freq 02:02:6F:23:12:0A

This works fine the first time. If I change the FREQ value to something else, e.g. 2462 (channel 11), the nodes don't see each other. Removing and reinserting the ath9k module solves this.
Interestingly iwconfig still shows the old frequency even if iw returned successfully.

Am I doing something wrong or is there a bug somewhere?

BTW: if you try the script, it expects an IP address as argument, e.g. "bash ibss.sh 172.16.5.1"

Thanks in advance
  Joerg

P.S.: Is there a way to get an overview of the current interface configuration with iw? What is the equivalent of "iwconfig wlan0"?

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Re: Switching channel in IBSS network doesn't work in ath9k

[Luis R. Rodriguez]

On Thu, Dec 10, 2009 at 9:46 AM, Holger Schurig
<holgerschurig@googlemail.com> wrote:
>> P.S.: Is there a way to get an overview of the current interface
>>  configuration with iw? What is the equivalent of "iwconfig wlan0"?
>
> There's none. Currently, iw iw written almost like a direct representation
> of cfg80211 commands. For things like "iw link", the code has added a bit of
> magic, so that this actually sends two cfg80211 command. But in general,
> it's a 1:1 relation.
>
> So, you'd need to write some "give me greatest amount of info" command newly
> for iw.

Actually I think a simple 'iw link' to do this for all interfaces
would be good. I just haven't gotten around to it. I should be
possible without upstream changes I believe.

  Luis

Re: Switching channel in IBSS network doesn't work in ath9k

[Holger Schurig]

> P.S.: Is there a way to get an overview of the current interface
>  configuration with iw? What is the equivalent of "iwconfig wlan0"?

There's none. Currently, iw iw written almost like a direct representation 
of cfg80211 commands. For things like "iw link", the code has added a bit of 
magic, so that this actually sends two cfg80211 command. But in general, 
it's a 1:1 relation.

So, you'd need to write some "give me greatest amount of info" command newly 
for iw.

-- 
http://www.holgerschurig.de

Re: Switching channel in IBSS network doesn't work in ath9k

[Holger Schurig]

> Actually I think a simple 'iw link' to do this for all interfaces
> would be good. I just haven't gotten around to it. I should be
> possible without upstream changes I believe.

Do you think that "iw link" should also show then info when the device is in 
monitor mode (e.g. return the flags) or in IBSS mode?  And probably also 
reporting parts of the survey data, e.g. noise floor?

That would be the equivalent of a "give me the greatest amount of info 
quickly" :-)

-- 
http://www.holgerschurig.de

Re: Switching channel in IBSS network doesn't work in ath9k

[Luis R. Rodriguez]

On Fri, Dec 11, 2009 at 8:39 AM, Holger Schurig
<holgerschurig@googlemail.com> wrote:
>> Actually I think a simple 'iw link' to do this for all interfaces
>> would be good. I just haven't gotten around to it. I should be
>> possible without upstream changes I believe.
>
> Do you think that "iw link" should also show then info when the device is in
> monitor mode (e.g. return the flags) or in IBSS mode?  And probably also
> reporting parts of the survey data, e.g. noise floor?
>
> That would be the equivalent of a "give me the greatest amount of info
> quickly" :-)

I do but johill is the maintainer, see what he thinks :)

  Luis

AW: Switching channel in IBSS network doesn't work in ath9k

[Joerg Pommnitz]

The iw feature was a side note. What about the channel switch? Can you
reproduce this? Is this supposed to work?

 -- 
Regards 
Joerg 




----- Ursprüngliche Mail ----
> Von: Luis R. Rodriguez <mcgrof@gmail.com>
> An: Holger Schurig <holgerschurig@googlemail.com>
> CC: Joerg Pommnitz <pommnitz@yahoo.com>; ath9k-devel@lists.ath9k.org; linux-wireless@vger.kernel.org
> Gesendet: Freitag, den 11. Dezember 2009, 17:41:48 Uhr
> Betreff: Re: Switching channel in IBSS network doesn't work in ath9k
> 
> On Fri, Dec 11, 2009 at 8:39 AM, Holger Schurig
> wrote:
> >> Actually I think a simple 'iw link' to do this for all interfaces
> >> would be good. I just haven't gotten around to it. I should be
> >> possible without upstream changes I believe.
> >
> > Do you think that "iw link" should also show then info when the device is in
> > monitor mode (e.g. return the flags) or in IBSS mode?  And probably also
> > reporting parts of the survey data, e.g. noise floor?
> >
> > That would be the equivalent of a "give me the greatest amount of info
> > quickly" :-)
> 
> I do but johill is the maintainer, see what he thinks :)
> 
>   Luis


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