In the wd_block_output (in wd.c) function, there is a moment where the buf (which is skb->data) is copied to the shared memory of the ethercard (if I understood it right). But I didn't found out when the message and headers (ip and udp for the case I am interested in) are copied in skb->data?? Also: what is exactly in skb->data?? Is there more than the message and the headers?? Also the rest of the skbuffer?? |