[PATCH RESEND] hostapd: add VHT tx power envelope IE

[Jouni Malinen]

On Thu, Nov 12, 2015 at 04:34:11PM +0530, Rajkumar Manoharan wrote:
> On Wed, Oct 28, 2015 at 11:00:05PM +0200, Jouni Malinen wrote:
> > On Fri, Oct 23, 2015 at 06:22:14PM +0530, Rajkumar Manoharan wrote:
> > > Add VHT transmit power envelope element defined in IEEE std
> > > 802.11ac-2013 8.4.2.164 for VHT bandwidth channel switch.
> >
> > Please note that this has been renamed to "Transmit Power Envelope
> > element" in REVmc (i.e., "VHT" removed from the name).
> >
> Will remove VHT in next version. Should I keep the spec. section as it
> is?

You could refer to IEEE P802.11-REVmc/D4.3, 8.4.2.161 for Transmit Power
Envelope element, but anyway, it is fine to use IEEE Std 802.11ac-2013
in the commit message and just remove VHT from the actual code changes.

> > > +	/*
> > > +	 * Local Maximum Transmit power is encoded as 2's complement
> > > +	 * with a 0.5 dB step
> > > +	 */
> > > +	max_tx_power = ~(chan->max_tx_power * 2) + 1;
> > > +	*eid++ = max_tx_power;
> > > +	*eid++ = max_tx_power;
> > > +	*eid++ = max_tx_power;
> > 
> > Could you please clarify why all three values are set to the same value?
> > Would there be no case where the local maximum transmit power is
> > different for 20, 40, and 80 MHz channel cases?
> >
> Since I do not find per bandwidth max tx power, I used the channel max
> tx power for all bandwith. Is there a way to extract per-bw max tx power from
> regulatory. Please help.

No idea how that could be done, but the design here does not look
correct.

-- 
Jouni Malinen                                            PGP id EFC895FA