I'm trying to implement the ethercat protocol into Orocos (www.orocos.org). To do this I want to use the RTNet with a Realtek rtl8139 network card.
So, I've installed RTNet on Xenamai and try to send and receive raw ethernet packages (ethercat data) using the rtl8139 driver. But I'm a bit confused on how to do this, especially the receiving part isn't really clear to me. The way I see it (please correct me if I'm wrong), the rx_interrupt function takes the data from the rx_ring and puts it on the skb_pool. Then the atomic variable \"ref_count\" is incremented with \"rtnetif_rx (skb)\", so the upper layer can see there has new data been received .
Now my question is, how do I reach the data that has been put on the skb_pool? Is there a function to do this? Or do I have to take to take the data with a function like \"sock_queue_rcv_skb()\" and increment \"ref_count\" myself?
Tom
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