TX_RING_MAXSIZE
struct be_txd be_txd[TX_RING_MAXSIZE];
struct happy_meal_txd happy_meal_txd[TX_RING_MAXSIZE];
#define NEXT_TX(num) (((num) + 1) & (TX_RING_MAXSIZE - 1))
#define PREV_TX(num) (((num) - 1) & (TX_RING_MAXSIZE - 1))
struct qe_txd qe_txd[TX_RING_MAXSIZE];