Note: this is a public e-mail We had a good IRC session, and were able to at least come up with a development roadmap to focus on: http://wireless.kernel.org/en/developers/DFS#Development_roadmap Some good news is we have a raise in hands by TI to participate in the development. Things we need to iron out for each development step: 1) Map countries to a DFS region bit The plan is to map each country in db.txt from wireless-regdb to a DFS region. There are only 3 known DFS regions: * FCC * ETSI * JP/Telco Michael, David, do you guys expect this to change any time soon (say 10 years or so)? Anyone else know? I can work on this. 2) Get DFS region to the driver through cfg80211 This is pretty straight forward once we have 1) done, and I can work on it. 3) Where do we stuff DFS parameters for each region One idea is to use the request_firmware() API as it is expected these parameters will be region and chipset specific. This requires a good review of all chipsets and with priority on the ones who have vendors or we have documentation for that we want to support in existing drivers. Today this means Atheros hardware and TI hardware. Vipin, I am curios how you intend on programming DFS with ath6kl (if this gets added, we should if TI is doing it ;) ), do you stuff all DFS parameters in firmware? Gery, how does TI do it?Most of the work here will involve hooking things up for mac80211 / cfg80211 / nl80211. This will consists of receiving DFS events from the driver for radar detection, keeping the NOL list, sending it to hostapd, choosing a random channel, and sending CSA to STAs. 4) Program hw DFS parameters ath9k_hw already has some knobs for this, Felix already submitted some of these changes upstream. Most of the work required here will take place on ath9k. 5) DFS events Most of the work here will involve hooking things up for mac80211 / cfg80211 / nl80211. This will consists of receiving DFS events from the driver for radar detection, keeping the NOL list, sending it to hostapd, choosing a random channel, and sending CSA to STAs. We can worry about this eventually, once we get the above 4 steps done. Luis
