Date: Fri, 3 Feb 2012 20:26:02 -0800 From: Adrian Chadd <adrian@freebsd.org> To: freebsd-wireless@freebsd.org Subject: [net80211] support vendor bitmap entries; teach if_ath to export PHY error code in error frames Message-ID: <CAJ-VmonSrcSQmZeENgH1fagnn6DOMhX6rC-n9=dOtypTabcSLg@mail.gmail.com>
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--20cf307f3092b43fc504b81bd36f Content-Type: text/plain; charset=ISO-8859-1 Hi, As part of my radar project, I'm going to try and teach the BSD/Linux ath driver and radiotap API about vendor extensions and implement a (reasonably) well documented way to expose what I need. The driver already exports the whole PHY error frame payload via radiotap and you can select which PHY error types are passed up by setting bits in the dev.ath.X.monpass sysctl. The trouble is the PHY error code isn't exposed so it currently isn't possible to know whether its a data or a PHY error frame. This patch is a WIP and implements what I need. In short: * The net80211 radiotap code doesn't know about vendor extension bitmap(s), so there's currently no way to take those into account when calculating the channel state offset in the header. Since the radiotap code directly writes into that (rather than have the driver do it per frame), adding any vendor bitmaps does mess things up quite a bit. * define a vendor attribute in if_athioctl.h - this should move to ieee80211_radiotap.h at some point. * Add fields to the ath RX radiotap struct, which includes the vendor bitmap, vendor attribute and the vendor payload. * Add a vendor payload, which includes the Atheros OUI and the RX status + PHY error code. With this, userland tools can be built to read the radar and spectral scan PHY error frames in userland. It makes prototyping code much, much easier. What I'm going to do to this: * Move the vendor attribute definition into ieee80211_radiotap.h; * Finalise on the Atheros vendor attribute layout. It doesn't match what is used in the reference driver but I'll use different vendor bitmap/namespace bytes, so things won't clash. * Document the new ieee80211_radiotap_attachv() and why it exists. I'd appreciate some feedback. Thanks! 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