Re: [RFC] How to store HT (40MHz) support

["Rafał Miłecki" <zajec5@gmail.com>]

W dniu 20 stycznia 2010 11:18 użytkownik Johannes Berg
<johannes@sipsolutions.net> napisał:
> On Wed, 2010-01-20 at 01:06 +0100, Rafał Miłecki wrote:
>> +             phy->use_40mhz = conf_is_ht(conf);
>
> This is wrong, conf_is_ht might also be 20mhz, look at the other
> helpers.

I tried to understand what actually is HT and after reading many
articles I have more knowledge but still I'm not 100% sure.

AFAIU:
1) HT means using more than 1 stream in channel (and can be on any:
20MHz or 40MHz)
2) conf_is_ht(...) checks if mac80211 want us to use more than 1
stream in channel
3) conf_is_ht40_minus(...) checks if we should use frequency below
current as additional 20MHz, so for example for channel 7 which is
2,431->2,453 we should use additinal 20MHz in channel 3 which is
2,411->2,433
4) conf_is_ht40_plus(...) checks if we should use frequency over
current as additional 20MHz, so for example for channel 3 which is
2,411->2,433 we should use additinal 20MHz in channel 7 which is
2,431->2,453

Is that correct?

-- 
Rafał