[Bug 1153] net/i40e: not all tx error counts in NIC statistics

[bugzilla]

https://bugs.dpdk.org/show_bug.cgi?id=1153

            Bug ID: 1153
           Summary: net/i40e: not all tx error counts in NIC statistics
           Product: DPDK
           Version: 21.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: khiz...@gmail.com
  Target Milestone: ---

in i40_ethdev.c, function i40e_read_stats_registers:

```
stats->oerrors  = ns->eth.tx_errors +
                  pf->main_vsi->eth_stats.tx_errors;
```

This code does not take into account `ns->tx_dropped_link_down` counter.
Correct oerrors should be:

```
stats->oerrors  = ns->eth.tx_errors +
                  pf->main_vsi->eth_stats.tx_errors +
                  ns->tx_dropped_link_down
```

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