Subject: Re: struct ifnet's if_softc field?
To: Dave McConnell <davem@eastcoast.co.za>
From: Jason Thorpe <thorpej@nas.nasa.gov>
List: tech-kern
Date: 05/14/1999 12:22:10 
On Fri, 14 May 1999 12:29:54 +0200 
 "Dave McConnell" <davem@eastcoast.co.za> wrote:

 > Why does "struct ifnet" have a "void *if_softc" as its first field. It 
 > seems unnecessary...

It's quite necessary, actually...

 > Isn't ifnet always the first field in a network drivers softc structure?

No, in fact, it's never the first field in a network driver's softc.  A
"struct device" is the first structure _always_ in a real device.

        -- Jason R. Thorpe <thorpej@nas.nasa.gov>