RING_SIZE
unsigned char ring[RING_SIZE];
#define advance_ring_ptr(p) ((p+1) & ~RING_SIZE)
xneti->xni_txring.req_cons & (RING_SIZE(&xneti->xni_txring) - 1)));
#define QAT_MAX_INFLIGHTS(RING_SIZE, MSG_SIZE) \
((((1 << (RING_SIZE - 1)) << 3) >> QAT_SIZE_TO_POW(MSG_SIZE)) - 1)