[ath9k-devel] AR9280 DFS -- high latency

[Mihai Moldovan <ionic@ionic.de>]

Hi Bruno,

* On 16.08.2013 05:59 PM, Bruno Alexandre Taraio dos Santos Antunes wrote:
> Could you or anybody in the mailing list please tell me what are the steps to enable DFS.

DFS has to be enabled on the kernel side and it's dependent on an option called
CFG80211_CERTIFICATION_ONUS which is only to be enabled iff your whole system is
"regulatory compliant" even with the options enabled by that (currently DFS only
for ath9k, I guess) option. Those additional options may or may not be
regulatory compliant for the time being.

This said, once CFG80211_CERTIFICATION_ONUS has been enabled and if your kernel
is recent enough (>= 3.10), you'll be able to enable DFS in the ath9k options
tree, the symbol for that is ATH9K_DFS_CERTIFIED.

Minding all of the above, I don't think OpenWrt has support for it... yet. Those
are fragile options when it comes to compliance and OpenWrt must make sure to be
regulatory compliant on a cross-device level, so hacks like that are likely
disabled for good for now and can only be turned on by manually configuring the
kernel.

This said, hostapd probably needs DFS support as well, and to the best of my
knowledge, only the git branch of hostapd has initial (read: incomplete) DFS
support. Again, I figure OpenWrt is packaging an older stable release version,
so using DFS may prove difficult.

Why do you even want to jump through all those hoops? It's probably not worth
it, at this stage of development. Also note the performance problems I encountered.

Best regards,


Mihai

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