linkstate w/o medium (was Re: CVS commit: src/sbin/ifconfig)

[David Young <dyoung%pobox.com@localhost>]

On Wed, Sep 14, 2016 at 02:00:17PM +0200, Joerg Sonnenberger wrote:
> On Wed, Sep 14, 2016 at 11:46:43AM +0000, Roy Marples wrote:
> > Module Name:	src
> > Committed By:	roy
> > Date:		Wed Sep 14 11:46:43 UTC 2016
> > 
> > Modified Files:
> > 	src/sbin/ifconfig: media.c
> > 
> > Log Message:
> > Don't bail if SIOGIFMEDIA doesn't return any media lists because we
> > can still report link status.
> 
> As I mentioned in the review, I think this is the wrong approach. I find
> the assumption that every interface supporting the IFMEDIA interface has
> at least one medium to be perfectly reasonable. Setting up and
> defaulting to one AUTO medium is two lines of code. Now we have to look
> for bugs in every consumer of this interface...

What about a tunnel interface whose encapsulation is not configured?
Seems that that has no medium (rather, it has a transport), but
nevertheless may have link status == DOWN.  Seems like you could have
such a condition in gre(4).

Dave 

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David Young         //\ Trestle Technology Consulting
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