[wireless-regdb] [PATCH 2/2] mac80211: implement support for configuring antenna gain

[Johannes Berg]

+ wireless-regdb

On Mon, 2013-10-07 at 10:29 +0200, Johannes Berg wrote:
> On Sat, 2013-10-05 at 13:18 +0200, Felix Fietkau wrote:
> 
> > > I understand. I don't understand the pieces about "max_antenna_gain".
> 
> > Right now ath9k has an antenna gain value in the EEPROM, and it compares
> > it against the channel max_antenna_gain value.
> 
> I just don't understand what the max means. If I connect a 5dBi gain
> antenna, but the "max antenna gain" is 3dBi, what should happen?
> 
> > Let's assume we have configured the tx power to the maximum value, the
> > regdb allows 3 dB antenna gain, and the ath9k EEPROM contains an antenna
> > gain of 3 dB as well.
> > If we now add another 3 dB of user-configured antenna gain, it first
> > starts tapping into the regulatory-allowed antenna gain before reducing
> > tx power in mac80211. The driver needs to know about this, so I put the
> > calculated maximum antenna gain into the hw conf as well.
> 
> I don't think it really works this way, does it? I don't believe the
> "regulatory-allowed antenna gain" is really something that's allowed on
> top of the EIRP?
> 
> johannes
> 
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