[Bug 1132] net/i40e changes recommended Rx ring_size after device start

[Bug 1132] net/i40e changes recommended Rx ring_size after device start

[bugzilla]

https://bugs.dpdk.org/show_bug.cgi?id=1132

            Bug ID: 1132
           Summary: net/i40e changes recommended Rx ring_size after device
                    start
           Product: DPDK
           Version: 22.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: andrew.rybchenko@oktetlabs.ru
  Target Milestone: ---

net/i40e changes recommended Rx ring_size after device start

NIC is Intel X710

It does not make sense since all Rx queues are typically already configured and
started.

It happens because of link_speeds condition above:
790 »·······} else {
 3791 »·······»·······/* For X710 */
 3792 »·······»·······dev_info->speed_capa = RTE_ETH_LINK_SPEED_1G |
RTE_ETH_LINK_SPEED_10G;
 3793 »·······»·······dev_info->default_rxportconf.nb_queues = 1;
 3794 »·······»·······dev_info->default_txportconf.nb_queues = 1;
 3795 »·······»·······if (dev->data->dev_conf.link_speeds &
RTE_ETH_LINK_SPEED_10G) {
 3796 »·······»·······»·······dev_info->default_rxportconf.ring_size = 512;
 3797 »·······»·······»·······dev_info->default_txportconf.ring_size = 256;
 3798 »·······»·······} else {
 3799 »·······»·······»·······dev_info->default_rxportconf.ring_size = 256;
 3800 »·······»·······»·······dev_info->default_txportconf.ring_size = 256;
 3801 »·······»·······}
 3802 »·······}

which are updated on device start in i40e_apply_link_speed().

Before start default_rxportconf.ring_size is 256, after start it is 512.

Found using [1]

[1]
https://ts-factory.io/doc/dpdk-ethdev-ts/generated/rst/group_usecases-dev_info_persistence.html#doxid-group-usecases-dev-info-persistence

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[Bug 1132] net/i40e changes recommended Rx ring_size after device start

[bugzilla]

https://bugs.dpdk.org/show_bug.cgi?id=1132

Andrew Rybchenko (andrew.rybchenko@oktetlabs.ru) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|dev@dpdk.org                |yuying.zhang@intel.com
                 CC|                            |beilei.xing@intel.com,
                   |                            |dev@dpdk.org

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