7ff1939db0
The pre-11n calculations include SIFS, but the 11n ones don't. The reason is that (mostly) the 11n hardware is doing the SIFS calculation for us but the pre-11n hardware isn't. This means that we're over-shooting the times in the duration field for non-11n frames on 11n hardware, which is OK, if not a little inefficient. Now, this is all fine for what the hardware needs for doing duration math for ACK, RTS/CTS, frame length, etc, but it isn't useful for doing PHY duration calculations. Ie, given a frame to TX and its timestamp, what would the end of the actual transmission time be; and similar for an RX timestamp and figuring out its original length. So, this adds a new field to the duration routines which requests SIFS or no SIFS to be included. All the callers currently will call it requesting SIFS, so this /should/ be a glorious no-op. I'm however planning some future work around airtime fairness and positioning which requires these routines to have SIFS be optional. Notably though, the 11n version doesn't do any SIFS addition at the moment. I'll go and tweak and verify all of the packet durations before I go and flip that part on. Tested: * AR9330, STA mode * AR9330, AP mode * AR9380, STA mode
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