[dpdk-dev] Bug in IPv4 header checksum computation?
N. Benes
nbenes at eso.org
Mon Apr 1 17:29:00 CEST 2019
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.
Cheers!
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