[PATCH] net: on ifup -a only detect devices when necessary

[Sascha Hauer]

On Fri, Apr 06, 2018 at 09:33:37PM +0200, Lucas Stach wrote:
> Am Freitag, den 06.04.2018, 15:16 +0200 schrieb Sascha Hauer:
> > For network boot we once used to hardcode eth0, but in latest changes
> > this was changed to work with different network devices and the 'ifup
> > eth0' was replaced with 'ifup -a' which lead to the result that we
> > now
> > detect all devices in order to eventually also bring up USB network
> > adapters. In most of the cases this is not desired. When a board has
> > internal network support this is likely to be used. With this patch
> > we only detect all devices when we do not have a network device
> > already.
> > For the unusual case in which a USB network adapter shall be used
> > even when an internal network interface is present we introduce the
> > global variable "global.net.ifup_force_detect" which can be used to
> > force detection of devices.
> 
> This may warrant some more documentation. Without the code change and
> the above commit message, the variable doc isn't too verbose about what
> it does exactly.

You're right. I added the following to the docs:

 +------------------------------+--------------+------------------------------------------------+
 | global.net.ifup_force_detect | boolean      | Set to true if your network device is not      |
 |                              |              | detected automatically during start (i.e. for  |
 |                              |              | USB network adapters)                          |
 +------------------------------+--------------+------------------------------------------------+

Sascha


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