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Re: [PATCHv5 0/8] Add DFS master ability

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> I'm sending this as patch to keep the versioning, although it can be
> considered as RFC, I would be suprised if all single channel/single
> interface aspects were considered correctly. :)

:)

I think we need a bit more "design review" first.

To me, the open questions are:
 * Should switching to a DFS channel be allowed at all? How so, if radar
   can't be tested before? You just stop the AP instead but userspace
   can do that just as well.
 * What happens with multiple virtual interfaces? You allow a single
   channel context only which makes sense, but that doesn't disallow
   things like having a client + AP, and then the client switching away
   because the P2P GO it was connected to randomly decided to switch.
   This would break radar detection. (1) What should happen in this
   case?
 * To avoid that problem, could restrict to a single virtual interface.
   However, that's unlikely to be sufficient -- you'd want to still be
   able to implement multi-BSSID APs which then switch together etc.
 * That raises another interesting question -- should multiple BSSIDs on
   the same channel really *all* call the driver's ap_channel_switch()
   callback? That seems ... strange!
 * Do we need any software channel switch handling?

Generally the biggest issue is around multi-channel channel switch
behaviour I think. Any good ideas?

johannes

(1) Actually today it would either break the AP (channel contexts NOT
supported by the driver) or disconnect the client (otherwise)

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