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Subject: Re: [PATCH 1/2] Revert "mac80211: support
 NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211_MAC_ADDRS"
To:     Johannes Berg <johannes@sipsolutions.net>,
        linux-wireless@vger.kernel.org
Cc:     Markus Theil <markus.theil@tu-ilmenau.de>
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From:   Denis Kenzior <denkenz@gmail.com>
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Date:   Mon, 24 Feb 2020 12:57:14 -0600
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Hi Johannes,

> That's a question of how you define "special data packet processing"...
> You're defining it purely in terms of the mechanics of how you handle
> them, but that's not really the point.

Why isn't it the point?  These are the only data packets userspace 
management daemon(s) actually care about and has to setup raw sockets + 
bpf filters for every interface it manages.  The current control port 
makes all of that unnecessary.

So from a holistic point of view, taking kernel + userspace into 
account, what is wrong with letting control port transport preauth 
frames if that saves a bunch of resources (and possibly wakeups if the 
bpf is setup badly) on the system?

Also, the question is what changed your mind?  I asked you specifically 
if preauth should be included in the control port API and you thought it 
was a good idea at the time?

> 
> Preauth frames are _not_ special. They're entirely regular data packets
> as far as wifi is concerned.

Sure.  I already conceded this point if this wasn't clear earlier.

Regards,
-Denis