missing superclass

Subject: missing superclass
From: Chris Neustrup <email@hidden>
Date: Mon, 22 Oct 2007 16:20:45 -0700
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I'm porting an ethernet driver from FreeBSD to OS X. Using xcode, the driver compiles correctly with no errors or warnings. When I execute kextload, it fails with the following:

kextload: extension cxgb3.kext appears to be valid
kextload: notice: extension cxgb3.kext has debug properties set
Can't find superclass for 5cxgb3 : 20IOEthernetController
kextload: a link/load error occured for kernel extension cxgb3.kext
load failed for extension cxgb3.kext

The source cpp file starts as:

#include <machine/limits.h>            /* UINT_MAX */
#include <libkern/OSByteOrder.h>

#include <IOKit/network/IONetworkController.h>
#include <IOKit/network/IONetworkInterface.h>

#include <IOKit/network/IOEthernetController.h>
#include <IOKit/network/IOEthernetInterface.h>

#include "cxgb3.h"

#define super IOEthernetController

OSDefineMetaClassAndStructors          ( cxgb3, IOEthernetController )

bool cxgb3::start( IOService * provider )
{
   bool  success = false;


Any hints would be appreciated.

Thanks in advance, Chris
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