Is using 802.11s with DFS possible?

Is using 802.11s with DFS possible?

[Zach Sherin]

Hi all,

I've been running some experiments in LEDE thanks to your help many
months ago, and I want to use DFS frequencies with my mesh network.
Does ath10k currently support this or am I up a creek? My tests show
that I can use DFS frequencies with AP mode but have always failed
when I use them in a mesh, such that the interface won't even start.

Any suggestions?

Thanks for your time,
Zach

PS: I'm using an Archer C7 v2, latest stable LEDE build with the
built-in ath10k firmware. Meshing on channel 36 is fine, but anything
that requires DFS fails.

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Re: Is using 802.11s with DFS possible?

[Peter Oh]

On 06/28/2017 06:54 PM, Zach Sherin wrote:
> Hi all,
>
> I've been running some experiments in LEDE thanks to your help many
> months ago, and I want to use DFS frequencies with my mesh network.
> Does ath10k currently support this or am I up a creek? My tests show
> that I can use DFS frequencies with AP mode but have always failed
> when I use them in a mesh, such that the interface won't even start.
>
> Any suggestions?
As far as I know, no DFS channels enabled in mesh mode at this moment.
To support DFS channels in mesh mode, wpa_supplicant and mac80211 
changes are required.
> Thanks for your time,
> Zach
>
> PS: I'm using an Archer C7 v2, latest stable LEDE build with the
> built-in ath10k firmware. Meshing on channel 36 is fine, but anything
> that requires DFS fails.
>


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Re: Is using 802.11s with DFS possible?

[Chun-Yeow Yeoh]

On Fri, Jun 30, 2017 at 1:53 AM, Peter Oh <peter.oh@bowerswilkins.com> wrote:
>
>
> On 06/28/2017 06:54 PM, Zach Sherin wrote:
>>
>> Hi all,
>>
>> I've been running some experiments in LEDE thanks to your help many
>> months ago, and I want to use DFS frequencies with my mesh network.
>> Does ath10k currently support this or am I up a creek? My tests show
>> that I can use DFS frequencies with AP mode but have always failed
>> when I use them in a mesh, such that the interface won't even start.
>>
>> Any suggestions?
>
> As far as I know, no DFS channels enabled in mesh mode at this moment.
> To support DFS channels in mesh mode, wpa_supplicant and mac80211 changes
> are required.
>

https://www.spinics.net/lists/linux-wireless/msg162307.html
Simon and Benjamin have submitted the above patches and some of them
has upstream to mac80211-next.

Perhaps, Simon and Benjamin can comment on this.

----
Chun-Yeow

>> Thanks for your time,
>> Zach
>>
>> PS: I'm using an Archer C7 v2, latest stable LEDE build with the
>> built-in ath10k firmware. Meshing on channel 36 is fine, but anything
>> that requires DFS fails.
>>
>
>
> _______________________________________________
> ath10k mailing list
> ath10k@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/ath10k

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Re: Is using 802.11s with DFS possible?

[Simon Wunderlich]

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On Friday, June 30, 2017 12:08:51 PM CEST Chun-Yeow Yeoh wrote:
> On Fri, Jun 30, 2017 at 1:53 AM, Peter Oh <peter.oh@bowerswilkins.com> 
wrote:
> > On 06/28/2017 06:54 PM, Zach Sherin wrote:
> >> Hi all,
> >> 
> >> I've been running some experiments in LEDE thanks to your help many
> >> months ago, and I want to use DFS frequencies with my mesh network.
> >> Does ath10k currently support this or am I up a creek? My tests show
> >> that I can use DFS frequencies with AP mode but have always failed
> >> when I use them in a mesh, such that the interface won't even start.
> >> 
> >> Any suggestions?
> > 
> > As far as I know, no DFS channels enabled in mesh mode at this moment.
> > To support DFS channels in mesh mode, wpa_supplicant and mac80211 changes
> > are required.
> 
> https://www.spinics.net/lists/linux-wireless/msg162307.html
> Simon and Benjamin have submitted the above patches and some of them
> has upstream to mac80211-next.
> 
> Perhaps, Simon and Benjamin can comment on this.

Our mac80211 patches have been upstreamed. However, the (experimental) 
wpa_supplicant patches have not been adopted and I've reworked them a little 
but they are not in a state to resubmit yet. So I don't expect the 
wpa_supplicant portion to work yet, and you also may need to think of a good 
way to have the mesh peers on a channel succession order.

Cheers,
     Simon

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Re: Is using 802.11s with DFS possible?

[Benjamin Berg]

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On Fri, 2017-06-30 at 11:48 +0200, Simon Wunderlich wrote:
> Our mac80211 patches have been upstreamed. However, the (experimental) 
> wpa_supplicant patches have not been adopted and I've reworked them a little 
> but they are not in a state to resubmit yet. So I don't expect the 
> wpa_supplicant portion to work yet, and you also may need to think of a good 
> way to have the mesh peers on a channel succession order.

For reference, an earlier version of the patchset was submitted as an
RFC in November with a bit of follow up discussion later:
 http://lists.infradead.org/pipermail/hostap/2016-November/036726.html
 http://lists.infradead.org/pipermail/hostap/2016-December/036741.html

There have been improvements since (e.g. solving the use after free
issue) that are not yet submitted. I cannot comment on the current
state of the patches though.

In general a major issue is making sure that all stations switch to the
same channel when a radar is detected. There is a simple mechanism in
the standard for this which to my knowledge is not implemented in
mac80211 at this point. But even with this in place you will likely
want a versatile mechanism in hostap for stations to switch to a common
channel should they end up on differing ones.

Regards,
Benjamin

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