Re: [RFA] HT extensions

[David Young <dyoung-e+AXbWqSrlAAvxtiuMwx3w@public.gmane.org>]

On Tue, Oct 05, 2010 at 08:50:16PM +0200, Johannes Berg wrote:
> On Tue, 2010-10-05 at 13:42 -0500, David Young wrote:
> > On Tue, Oct 05, 2010 at 08:27:43PM +0200, Johannes Berg wrote:
> > > On Tue, 2010-10-05 at 13:21 -0500, David Young wrote:
> > > > How can an application use the first/last-frame information?
> > > 
> > > Well, right now my wireshark patch is simply displaying it, but it could
> > > also link up frames of an a-MPDU so you can jump between them, and with
> > > this it can know what the framing was. If you just know a frame was part
> > > of an aMPDU you won't know which one, this should help.
> > 
> > I have my doubts about that.  How do you distinguish the case where the
> > NIC gives you the first MPDU of A-MPDU 1 and the last MPDU of A-MPDU 2
> > from the case where the NIC gives you the first and last MPDU of the
> > same A-MPDU?
> 
> You mean with imperfect capturing? Otherwise you should've seen the last
> of A-MPDU 1 inbetween that, I'd think. But you're right, doing this
> perfectly is quite hard, and I don't really have a good use case in mind
> either. I'm happy to leave it off, at least for now, until somebody can
> demonstrate a working way to convey this information.

I favor leaving it off for now.

Dave

-- 
David Young             OJC Technologies
dyoung-eZodSLrBbDpBDgjK7y7TUQ@public.gmane.org      Urbana, IL * (217) 278-3933