Bob Copeland <me@xxxxxxxxxxxxxxx> writes: > 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. Balaji, please reply to Bob's questions. I missed this thread while applying v5, sorry Bob. -- https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
