linux-kernel - Re: [PATCH] mac80211: Parse IEEE80211_RADIOTAP

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Message-ID: <1408953158.8665.15.camel@umadbro>
Date:	Mon, 25 Aug 2014 09:52:38 +0200
From:	Rostislav Lisovy <lisovy@...il.com>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
	Michal Sojka <sojkam1@....cvut.cz>, s.sander@...dsys.de,
	jan-niklas.meier@...kswagen.de,
	Rostislav Lisovy <rostislav.lisovy@....cvut.cz>
Subject: Re: [PATCH] mac80211: Parse IEEE80211_RADIOTAP_RATE on TX

On Mon, 2014-07-21 at 12:20 +0200, Johannes Berg wrote:
> On Thu, 2014-07-10 at 14:27 +0200, Rostislav Lisovy wrote:
> > Add support for parsing radiotap field IEEE80211_RADIOTAP_RATE
> > for transmitted frames. Use the provided datarate value in
> > info->control.rates[] array so it will be used for transmission.
> > 
> > Signed-off-by: Rostislav Lisovy <rostislav.lisovy@....cvut.cz>
> > ---
> > This feature is essential for Transmit Datarate Control (TDC)
> > in future implementation of IEEE 802.11-2012 "Wireless Access
> > for the Vehicular Environment" support.
> 
> It seems like an extremely bad idea to base your implementation of WAVE
> on monitor mode with injection.
> 
> Why can't you add a proper datapath?
> 

You are right. I was overthinking the per-packet datarate setting a
little bit.
If I am not mistaken it is not possible to say that this feature may be
useful as the general method for monitor-mode injection with datarate
until there is some user-space utility really using/needing it?

Best regards;
Rostislav


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