nl/cfg80211 scan result/event handling

[Johannes Berg <johannes@sipsolutions.net>]

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Hey,

Just a few notes as I'm thinking about these things. I probably won't be
implementing this quickly so I'm telling you, but who knows, maybe I'll
get around to it and then... Here's hoping for some feedback :)

Right now I'm thinking along the lines of:
void cfg80211_key_threshold_notify(struct wireless_dev *wdev,
				   int txrx_count,
				   u8 *mac);

or
void cfg80211_radar_notify(struct wireless_dev *wdev,
			   phymode, channel, ...)

and then cfg80211 is responsible for sending the appropriate nl80211
messages or doing whatever else to notify userspace.

As for scan results, we want those broadcast as well. I was thinking
that we have basically these choices:
 1) drivers (stack) aggregate data
 2) drivers (stack) call a function for each result
 3) hybrid

I tend towards 3 because it allows both, in a fashion like this:

cfg80211_add_scan_result(struct wireless_dev *wdev,
			 int n_results,
			 struct scan_result **sr);
cfg80211_scan_finished(struct wireless_dev *wdev);

and for the add_scan_result calls cfg80211 simply starts creating the
nl80211 message and then multicasts it to those who want it
(NL80211_GROUP_SCAN or such) on _scan_finished()

Thoughts?

johannes

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