[dpdk-dev] Non-working TX IP checksum offload
Angela Czubak
ACzubak at pl.ibm.com
Fri Jul 17 16:23:41 CEST 2015
Hi,
I have some difficulties using ip checksum tx offload capabilities - I
think I set everything as advised by the API documentation, but
unfortunately the packet leaves the interface with its ip checksum still
being zero (it reaches its destination).
What I do is:
buffer->ol_flags |= PKT_TX_IP_CKSUM|PKT_TX_IPV4;
ip_header->hdr_checksum = 0;
buffer->l3_len = sizeof(struct ipv4_hdr);
buffer->l2_len = sizeof(struct ether_hdr);
In L4 there's UDP, which checksum is zeroed if that matters.
Is there something I am missing? The NIC is Intel Corporation Ethernet
Controller X710 for 10GbE SFP+ (rev 01).
What is more, is there any particular reason for assuming in
i40e_xmit_pkts that offloading checksums is unlikely (I mean the line no
1307 "if (unlikely(ol_flags & I40E_TX_CKSUM_OFFLOAD_MASK))" at
dpdk-2.0.0/lib/librte_pmd_i40e/i40e_rxtx.c)?
Regards,
Angela
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