[dpdk-dev] [PATCH 0/3] i40e VXLAN TX checksum rework

Olivier MATZ olivier.matz at 6wind.com
Thu Nov 27 11:12:41 CET 2014

>> We have got some feedback about backward compatibility of VXLAN TX
>> checksum offload API with 1G/10G NIC after the i40e VXLAN TX checksum
>> codes were applied, so we have to rework the APIs on i40e, including
>> the changes of mbuf, i40e PMD and csum engine.
>> The main changes in mbuf are as follows,
>> In place of removing PKT_TX_VXLAN_CKSUM, we introducing 2 new flags:
>> PKT_TX_OUT_IP_CKSUM, PKT_TX_UDP_TUNNEL_PKT, and a new field: l4_tun_len.
> What about PKT_TX_OUT_UDP_CKSUM instead of PKT_TX_UDP_TUNNEL_PKT? It's
> maybe more coherent with the other names.

oh I just realized that the flag is not for asking to the hardware
to calculate the outer UDP checksum.
So why does the hardware need this information?

More information about the dev mailing list