[Bug 1067] I40E_VSI_TO_ETH_DEV (rxq->vsi) return null causes coredump

[Bug 1067] I40E_VSI_TO_ETH_DEV (rxq->vsi) return null causes coredump

[bugzilla]

https://bugs.dpdk.org/show_bug.cgi?id=1067

            Bug ID: 1067
           Summary: I40E_VSI_TO_ETH_DEV (rxq->vsi) return null causes
                    coredump
           Product: DPDK
           Version: 20.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: critical
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: chcchc88@163.com
  Target Milestone: ---

Created attachment 216
  --> https://bugs.dpdk.org/attachment.cgi?id=216&action=edit
core dump file bt

NIC: 
Intel XL710 vf
Ethernet controller: Intel Corporation Ethernet Virtual Function 700 Series

Coredump was generated when we tested the data sent and received by the XL710
vf NIC. The call stack shows that coredump occurs at this line of code：

dev->data->rx_mbuf_alloc_failed += rxq->rx_free_thresh;
it's in i40e_rxtx.c/rx_recv_pkts func,the code:
        if (rxq->rx_tail > rxq->rx_free_trigger) {
                if (i40e_rx_alloc_bufs(rxq) != 0) {
                        uint16_t i, j;

                        dev = I40E_VSI_TO_ETH_DEV(rxq->vsi);
                        dev->data->rx_mbuf_alloc_failed +=
                                rxq->rx_free_thresh;

                        rxq->rx_nb_avail = 0;
                        rxq->rx_tail = (uint16_t)(rxq->rx_tail - nb_rx);
                        for (i = 0, j = rxq->rx_tail; i < nb_rx; i++, j++)
                                rxq->sw_ring[j].mbuf = rxq->rx_stage[i];

                        return 0;
                }
        }

I40E_VSI_TO_ETH_DEV(rxq->vsi) return null.
I use gdb to break i40e_dev_rx_queue_setup func where rxq->vsi = vsi; 
rxq->vsi.adapter->eth_dev is null!
vsi comes from:
vf = I40EVF_DEV_PRIVATE_TO_VF(dev->data->dev_private);
vsi = &vf->vsi;
But in i40evf_init_vf func, I cant find init vf->vsi.adapter->eth_dev,I dont
known
why?

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