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From:   Ramon Fontes <ramonreisfontes@gmail.com>
Date:   Sun, 29 Sep 2019 14:20:25 -0300
Message-ID: <CAK8U23bbiGhmDg-ChDJtbRVVc_6njVdoUjfAhqM+V3yfQXTC4Q@mail.gmail.com>
Subject: Re: mac80211_hwsim (kernel 4.18+): wmediumd + 2.4Ghz
To:     Krishna Chaitanya <chaitanya.mgit@gmail.com>
Cc:     Johannes Berg <johannes@sipsolutions.net>,
        linux-wireless <linux-wireless@vger.kernel.org>
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> Still doesn't explain why it should work in 4.17 and not in 4.18, there
> aren't a lot of wifi changes there at all.

I just tested it with 4.15 and it didn't work. However, It works in
4.15 in other PC. At first these 2 PCs have the same packages with
apparently the same version. The only thing I can highlight about the
difference between them is that: (i) Ubuntu has been upgraded from
16.04 to 18.04 (it works fine up to 4.17) and (ii) Ubuntu 18.04 has
been installed from scratch (it doesn't work at all - tested from
4.15).

On Fri, Aug 30, 2019 at 5:22 AM Krishna Chaitanya
<chaitanya.mgit@gmail.com> wrote:
>
> On Fri, Aug 30, 2019 at 1:02 PM Johannes Berg <johannes@sipsolutions.net> wrote:
> >
> > On Fri, 2019-08-30 at 00:35 +0530, Krishna Chaitanya wrote:
> > >
> > > Is this supposed to work at all? AFAICS, in hwsim channel matching
> > > checks are only done in non-mediumd path (no_nl), and wmediumd also
> > > doesn't have any checks? So, hostapd responds to all probe requests in all
> > > channels. Am I missing something?
> >
> > Hmm. Interesting observation, I wasn't aware of that.
> >
> > That certainly explains the situation though - on 2.4 GHz we'd prefer
> > using the DS Element, and thus not use the scan result, while on 5 GHz
> > we assume that the reported RX frequency is correct (there's no channel
> > overlap).
> >
> > Still doesn't explain why it should work in 4.17 and not in 4.18, there
> > aren't a lot of wifi changes there at all.
> Yes the git log also doesn't show any changes in this area.
> >
> > I guess we should fix that in hwsim, anyone esle want to? :-)
> I can give it a try to move the channel matching logic to common
> code for both nl and no_nl.