[dpdk-dev] [Bug 590] Transmit errors with i40e VF using SR-IOV on a vSphere VM

[dpdk-dev] [Bug 590] Transmit errors with i40e VF using SR-IOV on a vSphere VM

[bugzilla]

https://bugs.dpdk.org/show_bug.cgi?id=590

            Bug ID: 590
           Summary: Transmit errors with i40e VF using SR-IOV on a vSphere
                    VM
           Product: DPDK
           Version: 20.11
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: christopher.swindle@metaswitch.com
  Target Milestone: ---

Overview:
I am trying to make use of DPDK with an XXV710 VF using SR-IOV on a vSphere VM,
however I am finding that with DPDK 20.11 that I am unable to transmit any
packets in my application. When running testpmd I find that there are no
packets transmitted and the tx-error stat just keeps getting incremented when a
packet is transmitted.

I did some further testing of different DPDK versions and found that the
following commit is the one that stopped these cards working in a vSphere VM:

https://github.com/DPDK/dpdk/commit/34283fc94847f237677edd5909639503c605daeb

When I revert this commit I find that i40e VFs on vSphere do work with DPDK
20.11.

Steps to Reproduce:
This can be reproduced with the following steps:
- Add an XXV710 VF SR-IOV interface to a vSphere VM
- Use testpmd to transmit packets on the vSphere VM (I used `testpmd -l 2,4,6
-- --stats-period=5 --forward-mode=mac --port-topology=loop`)

Actual Results:
The tx-error stats are incremented and no packets are transmitted.

Expected Results:
The packets should be transmitted.

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