http://ogris.de/vmware/vmxnet.diff

diff -dru vmxnet-only.orig/if_vxn.c vmxnet-only/if_vxn.c
--- vmxnet-only.orig/if_vxn.c	2012-02-15 16:07:44.000000000 +0100
+++ vmxnet-only/if_vxn.c	2012-05-20 11:50:34.932392264 +0200
@@ -135,7 +135,6 @@
 static void vxn_init(void *);
 static void vxn_start(struct ifnet *);
 static int vxn_ioctl(struct ifnet *, u_long, caddr_t);
-static void vxn_watchdog(struct ifnet *);
 static void vxn_intr (void *);

 static void vxn_rx(vxn_softc_t *sc);
@@ -471,7 +470,6 @@
    ifp->if_ioctl = vxn_ioctl;
    ifp->if_output = ether_output;
    ifp->if_start = vxn_start;
-   ifp->if_watchdog = vxn_watchdog;
    ifp->if_init = vxn_init;
    ifp->if_baudrate = 1000000000;
    ifp->if_snd.ifq_maxlen = sc->vxn_num_tx_bufs;
@@ -1148,24 +1146,6 @@

 /*
  *-----------------------------------------------------------------------------
- * vxn_watchdog --
- *	Watchdog function
- *
- * Results:
- *	None
- *
- * Side effects:
- *	Not implemented.
- *-----------------------------------------------------------------------------
- */
-static void
-vxn_watchdog(struct ifnet *ifp)
-{
-   printf("vxn%d: watchdog\n", VXN_IF_UNIT(ifp));
-}
-
-/*
- *-----------------------------------------------------------------------------
  * vxn_intr --
  *	Interrupt handler
  *