Hi, added more people in CC.
On 4/1/19 6:29 PM, N. Benes wrote:
Hi, I wrote to the users list a bit more a week ago concerning the IPv4 Header Checksum computation and received no comments on it yet: https://mails.dpdk.org/archives/users/2019-March/004021.html https://mails.dpdk.org/archives/users/2019-March/004022.html I have the impression that the current implementation wrongly does a conditional final inversion of the computed sum. This is correct for e.g. UDP, but I think it is not for an IPv4 Header (header checksum is not optional). If it is a bug, this could result in a surprisingly high number of invalid/dropped IPv4 packets, when the checksum is calculated manually via the DPDK API (not NIC-offloaded) and the IPv4 header has an appropriate combination of values e.g. the IP Identification field.
I agree that it looks like a bug in DPDK. RFC 791 says nothing about avoid zero value for IPv4 checksum. Andrew.
