expose selection of PMD fast-path functions before dev_start (rte_eth_dev_start)

https://bugs.dpdk.org/show_bug.cgi?id=1139

            Bug ID: 1139
           Summary: expose selection of PMD fast-path functions before
                    dev_start (rte_eth_dev_start)
           Product: DPDK
           Version: 22.07
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: [email protected]
          Reporter: [email protected]

Target Milestone: ---

Created attachment 235
--> https://bugs.dpdk.org/attachment.cgi?id=235&action=edit
diff

1. startup counsumer thread(main_loop) call rte_eth_rx_burst. but the real rx_burst is dummy_eth_rx_burst
2. call rte_eth_dev_start: will startup dev and expose selection of PMD fast-path functions
3. get xstats by name("rx_missed_errors"), maybe see misserr greater than 0

my solution：
expose selection of PMD fast-path functions before dev_start (rte_eth_dev_start)

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