Hi
I'm trying to use rte_eth_from_rings() to allow data exchange between cores using rings to be done in the same way as sending or receiving packets from an Ethernet device. However, I don't understand exactly how rte_mbuf descriptors are cleaned.
For example, for a forwarding application, I don't need to free an rte_mbuf when I use rte_eth_rx_burst() and rte_eth_tx_burst() on the real Ethernet device. Because the rte_eth_tx_burst() function picks up the next available descriptor in the transmit ring and frees the network buffer previously sent with that descriptor. As a result, I do not need to free rte_mbuf descriptor since it will be freed in rte_eth_tx_burst(). Please correct me if I'm wrong.
Does the same behavior apply to rte_eth_from_rings() model? If so, I have to copy the rte_mbuf from pseudo-Ethernet port (created by rte_eth_from_rings) to send to a real Ethernet port, otherwise it will be freed twice (in the 2th and 4rd below). Is there any other way than copy? Please correct me if it is wrong.
app_1
1) allocate rte_mbuf
2) sent the rte_mbuf to pseudo-Ethernet using rte_eth_tx_burst()
app_2
3) pseudo-Ethernet rte_eth_rx_burst()
4) real-Ethernet rte_eth_tx_burst()
Best regards...
Volkan
