[Bug 1127] net/i40e does not preserve RSS redirection table upon port stop/start

[bugzilla@dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=1127

            Bug ID: 1127
           Summary: net/i40e does not preserve RSS redirection table upon
                    port stop/start
           Product: DPDK
           Version: 22.07
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: andrew.rybchenko@oktetlabs.ru
                CC: ivan.malov@oktetlabs.ru
  Target Milestone: ---

net/i40e does not preserve RSS redirection table upon port stop/start

lib/ethdev/rte_ethdev.h line 86:

  79  * Please note that some configuration is not stored between calls to
  80  * rte_eth_dev_stop()/rte_eth_dev_start(). The following configuration
will
  81  * be retained:
  82  *
  83  *     - MTU
  84  *     - flow control settings
  85  *     - receive mode configuration (promiscuous mode, all-multicast mode,
  86  *       hardware checksum mode, RSS/VMDq settings etc.)
  87  *     - VLAN filtering configuration
  88  *     - default MAC address
  89  *     - MAC addresses supplied to MAC address array
  90  *     - flow director filtering mode (but not filtering rules)
  91  *     - NIC queue statistics mappings

defines that RSS settings must be retained across restart.

Example log from dpdk-ethdev-ts tests available [1]. Lines below are lines in
the log.

Steps to reproduce should be trivial and as far as I know testpmd has all
required functionality: 
 - configure more than 1 Rx queue, 
 - start port (line 38),
 - update reta (lines 41 and 43),
 - stop (line 72),
 - start again (line 74),
 - read reta (line 77) and compare (example log shows that RETA is reset to
default).
Obviously update should not match default configuration.

[1]
https://ts-factory.io/bublik/v2/log/189828?focusId=190450&mode=treeAndinfoAndlog

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