[Bug 1134] net/i40e Tx prepare unexpectedly rejects packet with tunnel type set and no offloads requested

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=1134

            Bug ID: 1134
           Summary: net/i40e Tx prepare unexpectedly rejects packet with
                    tunnel type set and no offloads requested
           Product: DPDK
           Version: 22.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev at dpdk.org
          Reporter: andrew.rybchenko at oktetlabs.ru
  Target Milestone: ---

net/i40e Tx prepare unexpectedly rejects packet with tunnel type set and no
offloads requested

Tunnel type (e.g. RTE_MBUF_F_TX_TUNNEL_VXLAN) is just an auxiliary information
which does not request any Tx offload itself (similar to RTE_MBUF_F_TX_IPV4).
So, if a packet has the tunnel type set it should not be rejected by
i40e_simple_prep_pkts() as unsupported offload requested. I.e.
RTE_MBUF_F_TX_TUNNEL_MASK should be included in
I40E_TX_OFFLOAD_SIMPLE_SUP_MASK.

Found using [1]. Line 48 [2] sets ol_flags. Line 79 [3] shows that the packet
is rejected by Tx prepare.  Requested Tx offload can be found in line 31 [4]

[1]
https://ts-factory.io/bublik/v2/log/243407?focusId=249938&mode=treeAndinfoAndlog
[2]
https://ts-factory.io/logs/2022/11/29/balin-x710-p0-22/html/node_id6531.html#line48
[3]
https://ts-factory.io/logs/2022/11/29/balin-x710-p0-22/html/node_id6531.html#line79
[3]
https://ts-factory.io/logs/2022/11/29/balin-x710-p0-22/html/node_id6531.html#line31

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