sk_rx_desc
struct sk_rx_desc *cur_desc;
bzero(rd->sk_rx_ring, sizeof(struct sk_rx_desc) * SK_RX_RING_CNT);
struct sk_rx_desc *r;
struct sk_rx_desc sk_rx_ring[SK_RX_RING_CNT];
SK_CDRXOFF((x)), sizeof(struct sk_rx_desc), (ops)); \