On Fri, 23 Dec 2022 07:00:40 +0000 NAGENDRA BALAGANI <nagendra.balag...@oracle.com> wrote:
> Hi, > > I am seeing strange behavior where rte_pktmbuf_clone is not giving desired > result. > Here is the detailed info, in my dpdk application , once I received the > packet info in mbuf, I need to send the same packet to two destinations, the > sequence I should follow is, > > (i) First, Tunnel the packet to one of desired destination, > so I created the shallow copy using rte_pktmbuf_clone, had another mbuf for > Outer IP Header for IPinIP tunnel and sent to NIC. > > (ii) Second, I need to modify the source and destination ip > addresses of the packet and send out. As you showed, that won't work like you think. A shallow clone means that both versions share the same data area. If you modify one one instance both change. The best practice is to consider a clone (or any mbuf with refcount > 1) as read only.
