[PATCH] net: Bring up all interfaces before going interactive

[Trent Piepho]

On Fri, Sep 16, 2022 at 6:16 AM Sascha Hauer <s.hauer at pengutronix.de> wrote:
>
> On Fri, Sep 16, 2022 at 02:49:42PM +0200, Sascha Hauer wrote:
> > So far we only bring up network interfaces when we actually need them.
> > This means we could be idling in the shell for long and once the user
> > decides to do networking he has to wait for the link to be established.
>
> We could make the user experience even a bit better by doing this call
> before waiting for the autoboot timeout which then speeds up netboot a
> bit.

The Linux phy driver almost invariably does not bother to avoid
resetting the network phy when not necessary.  So if network
auto-negotiation is started in barebox, it will be reset and then
restarted shortly after in Linux.  The link auto-negotiation impacts
the LAN's spanning tree if that is in use.

So there is a drawback, besides the small added boot time to
initialize the network hardware, to adding an unneeded network restart
in Barebox in the case where interactive mode is not entered and
network boot is not used.