atl1c_rx_free_desc
#define ATL1C_RFD_DESC(R, i) ATL1C_GET_DESC(R, i, struct atl1c_rx_free_desc)
sizeof(struct atl1c_rx_free_desc) * rfd_ring->count * rqc +
rfd_ring[i].size = sizeof(struct atl1c_rx_free_desc) *
struct atl1c_rx_free_desc *rfd_desc;