FM10K_CB
u16 idx = le16_to_cpu(FM10K_CB(skb)->fi.w.dglort) - 1;
FM10K_CB(skb)->tstamp = rx_desc->q.timestamp;
FM10K_CB(skb)->fi.w.vlan = rx_desc->w.vlan;
FM10K_CB(skb)->fi.d.glort = rx_desc->d.glort;