E1000_COLLISION_DISTANCE
tctl |= E1000_COLLISION_DISTANCE << E1000_COLD_SHIFT;
#define E1000_FDX_COLLISION_DISTANCE E1000_COLLISION_DISTANCE
#define E1000_HDX_COLLISION_DISTANCE E1000_COLLISION_DISTANCE
tctl_ext |= E1000_COLLISION_DISTANCE << E1000_TCTL_EXT_COLD_SHIFT;
tctl |= E1000_COLLISION_DISTANCE << E1000_COLD_SHIFT;
(E1000_COLLISION_DISTANCE << E1000_COLD_SHIFT) |