Added dev group. On Tue, Dec 9, 2025 at 10:11 PM narsimharaj pentam <[email protected]> wrote:
> Hi > > I have a query related to ip fragmentation handling in DPDK. > > The DPDK application is trying to send a larger packet than the configured > MTU on the interface, before sending the packet to the i40e PMD the packet > will > undergo fragmentation . The DPDK library function > *"rte_ipv4_fragment_packet"* is used for fragmentation. Function > *rte_ipv4_fragment_packet* will create > direct and indirect mbuf's for a fragment , *the indirect buffers will > have reference to the mbuf of the actual packet (zero copy).* > > The application will call function rte_eth_tx_burst to transmit fragments > , which internally invokes *i40e_xmit_pkts *, the question here is when > should main application > mbuf should be freed , can It be freed immediately after i40e_xmit_pkts > returns success, not sure because the mbuf's are queued up in software ring > before actual transmit, > I am worried about the fragments holding references to the main > application buffer. > > Thanks. > > BR > Narsimha >
