On Fri, Mar 29, 2019 at 04:19:47PM +0530, Balaji Pothunoori wrote: > From: Ashok Raj Nagarajan <arnagara@xxxxxxxxxxxxxx> > > This patch will add the support to control the transmit power for traffic > to a station associated with the AP. > > Underlying firmware will enforce that the maximum tx power will be based > on the regulatory requirements. If the user given transmit power is greater > than the allowed tx power in the given channel, then the firmware will use > the maximum tx power in the same channel. > > When 0 is sent to the firmware as tx power, it will revert to the default > tx power for the station. > > Tested Hardware : QCA9984 > Tested Firmware : 10.4-3.9.0.1-00013 I tried this on qca9984 with 10.4-3.9.0.2-00040, which claims to support this feature, and it didn't seem to work: - with global tx power limit set to 30 dBm, I started an iperf from station A -> B - while iperf underway, I did tcpdump on a monitor on B and looked at signal level in radiotap, in this case around -75 dBm - on A, changed the per-sta txpwr limit for B to something (tried as low as 1 dBm). verified via printk that it went through to the driver / firmware command and reported no error -> result: signal level unchanged - on A, changed the global tx power limit to 1 dBm -> result: signal level dropped to ~ -95 dBm Reading the description above, now I'm wondering if the txpower is max(sta-power,global-power)? If so, that seems a bit unintuitive to me, or at least isn't what I hoped for. I'd prefer to have per-sta power setting override the global power. -- Bob Copeland %% https://bobcopeland.com/
