Re: HE (11ax) extensions

[Simon Barber <simon-vp0mx6+5gkqFX2APIN6yfw@public.gmane.org>]

It’s not correctly implemented on captures from Macs - it increments for every MPDU. TSF is reliable on all platforms that I’ve seen, although has different reference points for different platforms.

One things that is very odd is the different parameters for MU - 4 sets, but I’ve only ever seen 1 MPDU reported. How is this supposed to be used?

Simon

> On Feb 13, 2017, at 11:39 AM, Johannes Berg <johannes-cdvu00un1VgdHxzADdlk8Q@public.gmane.org> wrote:
> 
> On Mon, 2017-02-13 at 11:33 -0800, Simon Barber wrote:
>> For HT and VHT one of the things that is missing is the total length
>> of aggregates (including padding) - it’s in the L-SIG header, would
>> be nice to have it exposed (since most chipsets pass up everything
>> that’s in the header).
> 
> I don't know about "most", but I know ours doesn't :-)
> 
>> Also some standardized way to put aggregates back together. My latest
>> wireshark extension uses same TSF as that clue.
>> See https://code.wireshark.org/review/#/c/20043/
> 
> We already have that, in the A-MPDU status field there's a reference
> number that's supposed to be constant within the same A-MPDU and change
> between consecutive A-MPDUs.
> 
> johannes