[Bug 1102] i40e: enabling Rx/Tx queue deferred start has no effect

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=1102

            Bug ID: 1102
           Summary: i40e: enabling Rx/Tx queue deferred start has no
                    effect
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev at dpdk.org
          Reporter: ivan.malov at oktetlabs.ru
  Target Milestone: ---

Created attachment 223
  --> https://bugs.dpdk.org/attachment.cgi?id=223&action=edit
probable fix

As part of the ongoing efforts [1] to bring up sophisticated DPDK PMD testing,
it was found that i40e had a bug in deferred queue start feature.

Test logs [2] and [3] suggest that the problem manifests itself both in Rx and
Tx cases. The target queue marked for deferred start proves active at the point
where the test has not yet asked to enable it.

Our takeaway from studying i40e code is that the driver does not check whether
a  queue has been marked for deferred start when enabling all queues on port
start. Please find the probable fix attached.

[1] http://mails.dpdk.org/archives/dev/2022-October/251663.html
[2] https://ts-factory.io/bublik/v2/log/100333?focusId=101010&mode=treeAndlog
[3] https://ts-factory.io/bublik/v2/log/100333?focusId=101022&mode=treeAndlog

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