NEXT_RX
#define NEXT_RX(N) (((N) + 1) & GRETH_RXBD_NUM_MASK)
#define NEXT_RX(idx) ((idx) + 1)
#define NEXT_RX(idx) ((idx) + 1)
#define NEXT_RX(idx) ((idx) + 1)
#define NEXT_RX(N) (((N) + 1) & (DE_RX_RING_SIZE - 1))
#define NEXT_RX(N) (((N) + 1) & (CP_RX_RING_SIZE - 1))
#define NEXT_RX(i) (((i) + 1) & (SEEQ_RX_BUFFERS - 1))
#define NEXT_RX(num) (((num) + 1) & (RX_RING_SIZE - 1))
#define NEXT_RX(N) (((N) + 1) & (RX_RING_SIZE - 1))
#define NEXT_RX(num) (((num) + 1) & (RX_RING_SIZE - 1))
#define NEXT_RX(num) (((num) + 1) & (RX_RING_MAXSIZE - 1))