VFB_RING_SIZE
(VFB_RING_SIZE - 1)];
uint32_t sc_ring[VFB_RING_SIZE];
(VFB_RING_SIZE - 1)]);
(VFB_RING_SIZE - 1)]);
sc->sc_ring[sc->sc_ring_count++ & (VFB_RING_SIZE - 1)] = word;