Re: [PATCH] wireless-regdb: add regulatory rules for Iraq (IQ)

[Johannes Berg <johannes@sipsolutions.net>]

Hi,

> As for 10 MHz, I don't think it is supported, so we don't really consider
> that case. I could be wrong though.
> 
> Johannes, could you shed some light on 10 MHz channel width support?

It's ... complicated?

We support a _very_ limited set of 5/10 MHz operation, but I think most
of it is fairly much unreachable from userspace. I asked about removing
it entirely a few years ago, and some people were opposed, but said
people also haven't actually helped take care of it or anything ... I
was just tempted again a little while back to remove it due to the rates
issues.

Ever since my commit 5add321c329b ("wifi: cfg80211: remove scan_width
support") I believe it has been unreachable on the *client* side, but
given that we still have some support in _nl80211_parse_chandef() and
chandef functions, I expect that it would be possible to still configure
an AP or monitor interface with 5/10 MHz, though only with drivers that
have WIPHY_FLAG_SUPPORTS_5_10_MHZ, i.e. ath5k, ath9k and hwsim. I
wouldn't mind removing it all though.


Is this a concern from a regulatory POV right now, due to say power
density by channel width? This feels somewhat familiar even with higher
channel widths - maybe it's time to add such an attribute to the regdb?

johannes