[Bug 1122] i40e: Rx QinQ strip does not work

[Bug 1122] i40e: Rx QinQ strip does not work

[bugzilla]

https://bugs.dpdk.org/show_bug.cgi?id=1122

            Bug ID: 1122
           Summary: i40e: Rx QinQ strip does not work
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: ivan.malov@oktetlabs.ru
  Target Milestone: ---

Test "usecases/vlan_strip_ip4" of the opensource ethdev verification suite [1]
has detected a possible bug in i40e PMD: enabling Rx QinQ stripping has no
effect.

The test sends a packet with two tags in the Ethernet header, the outer one
having TPID=0x88A8 and the inner one having TPID=0x8100. The packet arrives to
the receiver unaltered and with no indication of QinQ / VLAN presence in mbuf
flags.

The problem manifests itself in IPv6 case, too.

Should you wish to explore a detailed log example, please refer to [2]. From
over there, it is possible to observe results for other iterations exploring
the effects of various conditions.

[1] http://mails.dpdk.org/archives/dev/2022-October/251663.html
[2] https://ts-factory.io/bublik/v2/log/163204?focusId=164376&mode=treeAndlog

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