On Tue, Nov 25, 2014 at 7:04 PM, Johannes Berg <johannes@xxxxxxxxxxxxxxxx> wrote: > On Tue, 2014-11-25 at 19:00 +0800, YanBo wrote: >> On Tue, Nov 25, 2014 at 6:23 PM, Johannes Berg >> <johannes@xxxxxxxxxxxxxxxx> wrote: >> > From: Johannes Berg <johannes.berg@xxxxxxxxx> >> > >> > If there are no channels allowing 80 MHz to be used, then the >> > station isn't really VHT capable even if the driver and device >> > support it in general. In this case, exclude the VHT capability >> > IE from probe request frames. >> > >> >> FYI, there are some new devices could support the VHT even at 20Mhz >> band 2.4G mode. > > So in 2.4 GHz we typically don't have VHT anyway - and realistically you > can't support real "VHT" there, you can only support the new > modulations. I think this will require some custom (vendor-specific) > advertisement though, since VHT advertisement implies 80 MHz support. > > IOW, I think at this point this patch isn't a problem. If we really need > to support VHT modulations in 2.4 GHz (or even have devices that have > VHT modulation support, but no 80 MHz support in 5 GHz) then some new > advertisement will have to be done. > We already start the working to support the VHT modulations MCS8 and MCS9 support in 2.4G for ath10k devices, and it used the band->vht_cap = vht_cap to notification the mac80211, if we band it with 80MHz, it is do need another new advertisement for this as your said. Thanks BR /Yanbo -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
