VTNET_MAX_RX_SEGS
KASSERT(sc->vtnet_rx_mbuf_count < VTNET_MAX_RX_SEGS,
struct sglist_seg segs[VTNET_MAX_RX_SEGS];
VTNET_MAX_RX_SEGS : VTNET_MIN_RX_SEGS;
CTASSERT(((VTNET_MAX_RX_SEGS - 1) * MCLBYTES) >= VTNET_MAX_RX_SIZE);