[ovs-build] Still Failing: istokes/ovs#1125 (master - 56c3de3)

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Mon Nov 1 14:58:23 UTC 2021

Build Update for istokes/ovs

Build: #1125
Status: Still Failing

Duration: 16 mins and 2 secs
Commit: 56c3de3 (master)
Author: Wilson Peng
Message: datapath-windows:Reset PseudoChecksum value only for TX direction offload case

While testing OVS-windows flows for the DNAT/SNAT action, the checksum in
TCP header is set incorrectly when TCP offload is enabled by default. As a
result,the packet will be dropped on the Windows VM when processing the packet
 from Linux VM which has included correct checksum at first.  On the Windows VM,
 it has gone through two NAT actions and OVS Windows kernel will reset the
checksum to PseudoChecksum and then it will lose the original correct checksum
value which is set outside.

Back to the Nat TCP/UDP checksum value reset logic,it should reset it TCP checksum
To be PseudoChecksum value only on Tx direction for TCP Offload case.  For the packet
>From the outside,  OVS Windows Kernel does not need reset the TCP/UDP checksum as
It should be the job of the received network driver to get out a correct checksum

>>>sample flow on default configuration on both Windows VM and Linux VM
(src=,dst=>dnat/snat-> (src=,
Dst= Without the fix the return back packet(src=,
Dst= will have the correct TCP checksum. After the reverse NAT
Actions, it will be changed to be packet (src=, Dst=
But with incorrect TCP checksum 0xa97a which is
The PseudoChecksum. Related packet is put on the reported issue below.

Signed-off-by: Wilson Peng <pweisong at vmware.com>
Signed-off-by: Alin-Gabriel Serdean <aserdean at ovn.org>

View the changeset: https://github.com/istokes/ovs/compare/ae2424696cff...56c3de3c61e6

View the full build log and details: https://app.travis-ci.com/github/istokes/ovs/builds/240950698?utm_medium=notification&utm_source=email


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