S_MAC_SLOT_SIZE
#define M_MAC_SLOT_SIZE _SB_MAKEMASK(10, S_MAC_SLOT_SIZE)
#define V_MAC_SLOT_SIZE(x) _SB_MAKEVALUE(x, S_MAC_SLOT_SIZE)
#define G_MAC_SLOT_SIZE(x) _SB_GETVALUE(x, S_MAC_SLOT_SIZE, M_MAC_SLOT_SIZE)