[wireless-regdb] [PATCH] wireless-regdb: add DFS CAC time parameter

[Janusz Dziedzic]

On 9 June 2014 10:00, Felix Fietkau <nbd at openwrt.org> wrote:
> On 2014-05-21 18:03, Johannes Berg wrote:
>> On Tue, 2014-05-20 at 11:48 -0700, Luis R. Rodriguez wrote:
>>
>>> > I think we should, but if we can't then at least can we cut to an
>>> > extensible format?
>>
>> I don't see any way to extend the format right now.
>>
>> There's a wrinkle with making it more extensible too though - if we do
>> that then we must be extremely careful that future older crda versions
>> (i.e. the next version that we're about to write) will not parse a newer
>> extended file more permissively, so our extensions are limited anyway.
>>
>> Looks like the format update really is needed, which probably means we
>> should change the scripts to generate two databases and change the
>> filename, or so?
> How about making the format properly extensible by reusing what we're
> already doing to keep the kernel ABI stable? For example, we could store
> the database in a netlink-like attribute format, with some changes to
> make it fixed endian.
> I'm already doing just that for a few things in OpenWrt, so I have
> working C code for writing and parsing such a format.
>
> Another nice feature would be to indicate in the attributes if crda is
> required to understand them, or if it can just continue with a warning.
>
> If done right, I think we can probably make this the last time we change
> the format version.
>
What kind of benefit we have having binary format between crda <->
wireless-regd (nl-based or current regulatory.bin)?
This is additional code/work to do - why we need that?

BR
Janusz