IFM_TMASK
*oldwd = (*newwd & ~(_IFM_ETH_XTMASK | IFM_TMASK)) | IFM_OTHER;
ifmr->ifm_active &= ~IFM_TMASK;
ifmr->ifm_active &= ~IFM_TMASK;
IFM_ETHER_SUBTYPE_GET(x) : ((x) & IFM_TMASK))
#define IFM_ETHER_SUBTYPE(x) (((x) & IFM_TMASK) | \
#define IFM_ETHER_SUBTYPE_GET(x) ((x) & (IFM_TMASK | _IFM_ETH_XTMASK))