[Bug 1241] DPDK 18.11.5: i40e PMD fails to start X710 port when set mtu.

[Bug 1241] DPDK 18.11.5: i40e PMD fails to start X710 port when set mtu.

[bugzilla]

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https://bugs.dpdk.org/show_bug.cgi?id=1241

            Bug ID: 1241
           Summary: DPDK 18.11.5: i40e PMD fails to start X710 port when
                    set mtu.
           Product: DPDK
           Version: 18.11
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: 18309220061@163.com
  Target Milestone: ---

When i use the i40e PMD to set the mtu, as follows:
1.  rte_eth_dev_ stop
2.  rte_eth_dev_set_mtu
3.  rte_eth_dev_start
The 1 and 2 steps are normal, but step 3 fails.
Log as follows:

i40e_alloc_rx queue mbufs(): Failed to allocate mbuf for RX
i40e alloc_rx queue mbufs(): Failed to allocate mbuf for RX
i40e dev rx queue start(): Failed to allocate RX queue mbuf
i40e dev switch queues(): Failed to switch rx queues
i40e dev start): Failed to enable VsI
i40e dev rx queue start(): Failed to allocate Rx queue mbuf
i40e dev switch queues(): Failed to switch rx queues
i40e dev start(): Failed to enable VSI

I don't know why?Sometimes it's normal and sometimes it's not.Only X710 nics
has the issue.

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