2010/1/21 Rafał Miłecki <zajec5@xxxxxxxxx>: > W dniu 20 stycznia 2010 11:18 użytkownik Johannes Berg > <johannes@xxxxxxxxxxxxxxxx> 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) No, you can have single stream HT devices. > 2) conf_is_ht(...) checks if mac80211 want us to use more than 1 > stream in channel No, conf_is_ht() tells you whether or not the current device configuration is set up to be on HT configuration. > 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 Right it just means the secondary channel is on the lower part of the primary, ht40_plus means its above. > 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? Almost, may want to read this: http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n I hope that helps. Luis -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
