There's a PCU NAV register that you can read, yes.
Adrian On 17 January 2013 15:18, Hugh O'Brien <hugh.obr...@ul.ie> wrote: > Hi Adrian, thank you for taking a look. > > I have a monitor device next to the target which is in promiscuous mode from > which I can see that the device injecting CTS frames (another device) is > functioning. It's just that the target's behaviour is puzzling as it doesn't > necessarily respect the CTS, or doesn't receive it. > > One theory I have is that the power saving mode is preventing it from > receiving the frame, so it unwittingly wakes up to send its frame when the > channel _should_ be kept clear. Unfortunately CSMA doesn't help here as I'm > trying to clear the channel for another protocol. > > Do you think it might be possible to get some visibility into the current > value of the NAV timer? That would certainly be informative for MAC > research. > > Hugh > > > > > On 17 January 2013 15:37, Adrian Chadd <adr...@freebsd.org> wrote: >> >> On 16 January 2013 18:45, Hugh O'Brien <hugh.obr...@ul.ie> wrote: >> > Hi there, >> > >> > I'm doing some research on CTS based co-existence with wifi for other >> > 2.4GHz >> > protocols. I've been using packet injection to get the CTS frames on the >> > air, which I can verify, but I'm not sure that certain stations are >> > receiving them, as their radio occupancy seems unaffected. >> > >> > Is there a way to see how many CTS packets the ath5k driver has seen? >> > I'm >> > unsure if NAV properties make it up to the driver level, would anyone >> > know >> > if the chipset could be interrogated for those values? >> >> Hm, it doesn't _look_ like the chips have a CTS received counter. >> >> There's AR_RTS_OK / AR_RTS_FAIL but I don't know if that's a MAC TX >> RTS counter, or a MAC RX RTS counter. >> And that doesn't help for CTS-to-self, which doesn't have an RTS exchange. >> >> What about just enabling promisc mode and counting the RTS/CTS/ACK >> exchanges? >> >> >> >> adrian > > _______________________________________________ ath5k-devel mailing list ath5k-devel@lists.ath5k.org https://lists.ath5k.org/mailman/listinfo/ath5k-devel
