netifd Call Flow - WiFi

[Paul Oranje]

Op 16 mrt. 2023, om 05:06 heeft Ravi Paluri (QUIC) <quic_rpaluri at quicinc.com> het volgende geschreven:
> 
> I think wifi interface going up and coming down is expected.
> Can anyone help with flow how does netifd know that wifi interface is up and where it adds this IP to the interface?
The netifd daemon implements a FSM [0] (several nested FSMs, though I haven't looked into the sources) and as such the actual call flow will be dependent on the state of the FSM when it processes a specific event (or command).

Have a look at the DESIGN doc [1]. That rather terse document ends though with "## TODO: Configuration management, ubus callbacks" so you'll have to look into the code to see how uci changes are handled. Maybe this helps understanding observed state transitions when for instance handling a configuration change.

Good luck

[0] https://en.wikipedia.org/wiki/Finite-state_machine
[1] https://github.com/openwrt/netifd/blob/master/DESIGN

> 
> Thanks,
> Ravi
> -----Original Message-----
> From: openwrt-devel <openwrt-devel-bounces at lists.openwrt.org> On Behalf Of Ravi Paluri (QUIC)
> Sent: Thursday, March 16, 2023 6:37 AM
> To: openwrt-devel at lists.openwrt.org
> Subject: netifd Call Flow - WiFi
> 
> Hi All,
>      We are trying netifd to enable wlan.
> We have configured uci to set wlan interface IP statically.
> We are seeing when we do network reload, wifi interface is going down and coming up.
> 
> Can we get flow how does netifd know that wifi interface is up and where it adds this IP to the interface?
> This will help us in checking why wifi interface is going down and coming up on doing network reload.
> 
> Thanks,
> Ravi
> 
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