Re: [PATCH v2 11/22] cfg80211: parse S1G Operation element for BSS channel

Johannes Berg
2020-09-21T06:54:09Z

On Sun, 2020-09-20 at 22:12 -0700, Thomas Pedersen wrote:
> On 2020-09-18 03:45, Johannes Berg wrote:
> > On Mon, 2020-08-31 at 13:55 -0700, Thomas Pedersen wrote:
> > > Extract the BSS primary channel from the S1G Operation
> > > element.
> >
> > Out of curiosity, do you even need to?
> >
> > I mean ... you know what channel you received it on, surely?
>
> Consider the case where the BSS is operating @ 2Mhz, but primary is one
> of
> the 1Mhz channels. The hardware (or driver) may not be able to tell you
> exactly which primary channel (upper or lower) the packet came in on.

Ah, OK, makes sense. Somehow based on a comment somewhere else I thought
you were saying that the channels are basically all unique in their
(center frequency, bandwidth) tuple, and was assuming you'd actually
have to scan them that way.

johannes