RX_RING_ENTRIES
#define RX_RING_MASK (RX_RING_ENTRIES - 1)
#define RX_RING_SIZE (RX_RING_ENTRIES * sizeof(u64))
struct sk_buff *rx_skbs[RX_RING_ENTRIES];
for (i = 0; i < RX_RING_ENTRIES; i++) {
for (i = 0; i < RX_RING_ENTRIES; i++) {
(RX_RING_ENTRIES << METH_RX_DEPTH_SHIFT);
rx_packet *rx_ring[RX_RING_ENTRIES];
dma_addr_t rx_ring_dmas[RX_RING_ENTRIES];
struct sk_buff *rx_skbs[RX_RING_ENTRIES];
#define ADVANCE_RX_PTR(x) x=(x+1)&(RX_RING_ENTRIES-1)