Re: CSME integration - next steps, network selection

[Thomas Haller <thaller redhat com>]

On Tue, 2022-03-08 at 08:35 +0200, Emmanuel Grumbach via
networkmanager-list wrote:
> I realized I am missing a piece before this.
> I need to be able to get and handle nl80211 events, which means that
> I
> need a thread or event loop or something that listens to the nl80211
> channel and parses events. The event I need is the end of the
> connection from the CSME side. This brings to the fundamental
> question
> of the threading model in NetworkManager.
> Do we have a sort of event loop? Looks like the NetworkManager runs
> on
> an event loop and very few things run in a different thread, but I
> couldn't really see any clear information about it.


Hi,


we use a glib mainloop. Read
https://tecnocode.co.uk/2014/03/27/what-is-gmaincontext/

There is only one thread (except, that GDBus spawns a worker thread
internally and that we might do a blocking write to sysctl on a thread,
but NM itself is for the most case single threadded).

In this case, you would poll on the file descriptor. So use
`nm_g_unix_fd_add_source()`.


best,
Thomas

> Thoughts?
>
> Thanks :)
>
> Emmanuel Grumbach
> egrumbach gmail com
>
> On Mon, Mar 7, 2022 at 5:00 PM Emmanuel Grumbach
> <egrumbach gmail com> wrote:
> > Hi,
> >
> > Next steps about the CSME integration :)
> > Now the flow I need is to do the following in case os_owner is
> > false:
> > List all the connections configured on wifi
> >     * If none match what we got from CSME - we do nothing and wait
> > until CSME will remove the rfkill
> >     * If there is a match, we need pick that connection  but
> > connect
> > to the same bssid as CSME was connected to
> > Then we can ask for ownership
> >
> > I saw there is nm_setting_wireless_get_bssid which will tell us if
> > the
> > connection has a bssid (not sure I am correct here) and if there is
> > a
> > bssid, we'll connect to that same AP. Is that something I can use?
> >
> > Maybe I should create another connection with a specific bssid and
> > "disable" all the others? not sure what's the right way to go here.
> > Another thing we'll need is to limit the scan on the channel on
> > which
> > the AP we look for is working. We don't want to waste time to scan
> > all
> > the channels. The supplicant has a configuration for that.
> >
> > Any guidance will be appreciated :)
> >
> > I'll continue digging anyway.
> >
> > Thanks!
> >
> > Emmanuel Grumbach
> > egrumbach gmail com
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