[net80211] begin teaching the scan layer about full offload.

[adrian]

Summary

• add a flag to say "full offload"
• don't do probe requests when scanning - firmware can do that
• don't do powersave transitions and buffering - firmware can do that

[avos]

So, firmware-based scanning will not be implemented as an 'ieee80211_scan_fw' module?

[adrian]

Heh, I'm not sure yet.

A lot of the code in scan_sw.c seems like useful boiler plate code still. The taskqueue running some of the things is also useful boiler plate. I'm just trying to figure out what else is needed - maybe just replacing, say, the taskqueue that implements individual channel scanning instead of the whole thing being methods.

What do you think?

[adrian]

eg, things like "cancel scan", "is scan finished" methods to query the driver may be useful here.

[adrian]

(since NICs like if_rsu can't JOIN a network until SCAN is done.. :/ )

[avos]

In D8262#171838, @adrian wrote:

eg, things like "cancel scan", "is scan finished" methods to query the driver may be useful here.

+ a watchdog (since it may hang); some special 'get scan results' callback for rsu(4) and similar (is there any?); no 'cancel_anyscan' when firmware can handle both scan & Tx etc

Anyway, this patch is fine; the aforementioned functionality can be implemented/used after checking IEEE80211_FEXT_SCAN_OFFLOAD flag.