radiotap.netbsd.org archive mirror
 help / color / mirror / Atom feed
From: bruno randolf <bruno-L9ZBdB2wSWtl57MIdRCFDg@public.gmane.org>
To: "Luis R. Rodriguez" <mcgrof-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: linux-wireless
	<linux-wireless-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	radiotap-rN9S6JXhQ+WXmMXjJBpWqg@public.gmane.org,
	Ivan Seskar
	<Seskar-NvJAj8134tRxEa0u/P/EHDe48wsgrGvP@public.gmane.org>,
	Haris Kremo
	<harisk-NvJAj8134tRxEa0u/P/EHDe48wsgrGvP@public.gmane.org>,
	"John W. Linville"
	<linville-2XuSBdqkA4R54TAoqtyWWQ@public.gmane.org>,
	Simon Barber <simon-r/za7OOdgF0ztatW0fm/fQ@public.gmane.org>,
	Dan Williams <dcbw-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Luis Carlos Cobo <luisca-W/OLz77bvjtBDgjK7y7TUQ@public.gmane.org>,
	Javier Cardona <javier-W/OLz77bvjtBDgjK7y7TUQ@public.gmane.org>,
	Sam Leffler <sam-zZXckVAlHaQAvxtiuMwx3w@public.gmane.org>,
	Jean Tourrilhes <jt-sDzT885Ts8HQT0dZR+AlfA@public.gmane.org>,
	Stefano Brivio
	<stefano.brivio-hl5o88x/ua9eoWH0uzbU5w@public.gmane.org>,
	Johannes Berg <johannes-cdvu00un1VgdHxzADdlk8Q@public.gmane.org>
Subject: Re: [RFC] RCPI support in radiotap and in our wireless subsystems
Date: Fri, 7 Mar 2008 17:57:18 +0900	[thread overview]
Message-ID: <200803071757.19302.bruno__15510.275544557$1216696540$gmane$org@thinktube.com> (raw)
In-Reply-To: <43e72e890803061904h742df37fuaa12977c45e457a-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

On Friday 07 March 2008 12:04:24 Luis R. Rodriguez wrote:
> >  it could be changed to something like:
> >
> >   * @signal: signal strength in dBm above noise or RCPI according to flag
>
> As it stands I don't think all drivers could populate this field under
> that description. For example, ssi in b43 is set to some magical value
> we have no clue what it means.
>
> We *could* test this stuff and see if it matches RCPI for each device,
> or just try to figure out at least what RSSI is wrt to the observed
> signal through a spectrum analyser (and even jssi is for b43) but I
> wonder how this will change upon hw revisions.
>
> >   * @noise: PHY noise in dBm when receiving this frame
> >   (remove ssi)
>
> Again, the problem in clarifying this also puts a restriction on what
> driver developers may know about their hardware.

yes, but you suggested RCPI which is even more difficult to deliver. well - i 
don't know *any* device which could...

ok. what about 3 hw flags then?

something like:
_SIGNAL_RSSI_UNITLESS
_SIGNAL_RSSI_DBM
_SIGNAL_RCPI

so mac80211 can fill in the right radiotap headers, and drivers can make it 
clear what they support. it's clear that drivers should strive to deliver the 
most exact when they can.

we have the same problem with the rx timestamp. we made a definition and ath5k 
for example can't deliver. but i think a clear definition and a clear note 
where it cannot be delivered is better than no definition at all :)

bruno

  parent reply	other threads:[~2008-03-07  8:57 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <43e72e890803061238u50847f1fs587627c5fac028d6@mail.gmail.com>
     [not found] ` <43e72e890803061238u50847f1fs587627c5fac028d6-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2008-03-06 20:55   ` [RFC] RCPI support in radiotap and in our wireless subsystems Ivo van Doorn
2008-03-07  0:32   ` bruno randolf
     [not found] ` <200803070932.51396.bruno@thinktube.com>
     [not found]   ` <200803070932.51396.bruno-L9ZBdB2wSWtl57MIdRCFDg@public.gmane.org>
2008-03-07  3:04     ` Luis R. Rodriguez
     [not found]   ` <43e72e890803061904h742df37fuaa12977c45e457a@mail.gmail.com>
     [not found]     ` <43e72e890803061904h742df37fuaa12977c45e457a-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2008-03-07  8:57       ` bruno randolf [this message]
     [not found]     ` <200803071757.19302.bruno@thinktube.com>
     [not found]       ` <200803071757.19302.bruno-L9ZBdB2wSWtl57MIdRCFDg@public.gmane.org>
2008-03-07 15:41         ` Luis R. Rodriguez
2008-03-06 20:38 Luis R. Rodriguez

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='200803071757.19302.bruno__15510.275544557$1216696540$gmane$org@thinktube.com' \
    --to=bruno-l9zbdb2wswtl57midrcfdg@public.gmane.org \
    --cc=Seskar-NvJAj8134tRxEa0u/P/EHDe48wsgrGvP@public.gmane.org \
    --cc=dcbw-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org \
    --cc=harisk-NvJAj8134tRxEa0u/P/EHDe48wsgrGvP@public.gmane.org \
    --cc=javier-W/OLz77bvjtBDgjK7y7TUQ@public.gmane.org \
    --cc=johannes-cdvu00un1VgdHxzADdlk8Q@public.gmane.org \
    --cc=jt-sDzT885Ts8HQT0dZR+AlfA@public.gmane.org \
    --cc=linux-wireless-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
    --cc=linville-2XuSBdqkA4R54TAoqtyWWQ@public.gmane.org \
    --cc=luisca-W/OLz77bvjtBDgjK7y7TUQ@public.gmane.org \
    --cc=mcgrof-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org \
    --cc=radiotap-rN9S6JXhQ+WXmMXjJBpWqg@public.gmane.org \
    --cc=sam-zZXckVAlHaQAvxtiuMwx3w@public.gmane.org \
    --cc=simon-r/za7OOdgF0ztatW0fm/fQ@public.gmane.org \
    --cc=stefano.brivio-hl5o88x/ua9eoWH0uzbU5w@public.gmane.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).