PFCP messages bad UDP checksum
v0rdych opened this issue · 2 comments
Hi, I've tried to run UPF in docker environment in "dpdk" mode. Everything works fine, but outgoing packets from N4 interface (bess-pfcpiface) have wrong checksums and are also non-zero.
I've tried to disable all checks:
confg/upf.json:
"hwcksum": false,
conf/up4.bess:
set all entries of "verify" to "False"
But behavior doesn't change - still bad, non-zero checksums in udp. L3 IP checksums are correct.
I've checked tcpdump in bessctl on "Acces-interface-name_QSplit in 0" interface, and there is already non-zero bad checksums, but could not find exact point in source code where this checksum is generated. It seems that there is missed pipeline from "Acces-interface-name_Slow" to outerUDPCsum but I'm not sure.
If I run UPF in "af_packet" mode, than UDP packets for pfcp messages are correct.
Could you please advise how to diagnose that?
Seems that executing this command on host resolves the problem:
ip netns exec pause ethtool -K "Acces-interface-name" tx off
This was server with Intel x710 adapter, and there were created several sriov VFs on it for using as Access and Core interfaces.
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