bnxt: RTE_ETH_TX_OFFLOAD_VLAN_INSERT doesn't insert vlan

http://bugs.dpdk.org/show_bug.cgi?id=1910

            Bug ID: 1910
           Summary: bnxt: RTE_ETH_TX_OFFLOAD_VLAN_INSERT doesn't insert
                    vlan
           Product: DPDK
           Version: 25.07
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: [email protected]
          Reporter: [email protected]

Target Milestone: ---

On 57608, RTE_ETH_TX_OFFLOAD_VLAN_INSERT doesn't seem to be working; it is reported as a supported capability, but the VLAN is not actually added. The same codebase works with other nics.

I also tried testpmd

port stop 0
port config 0 tx_offload vlan_insert on
tx_vlan set 0 133
port start 0
start tx_first 1

I don't see VLAN on the other side.

As far as I remember, when TruFlow is enabled, 57608 doesn't support VLAN stripping, so maybe it is the same case for VLAN insertion as well, but then RTE_ETH_TX_OFFLOAD_VLAN_INSERT shouldn't be reported as supported by pmd, haven't tried without TruFlow.

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