[DPDK/ethdev Bug 1716] virtio_xmit_cleanup failed when vm rx/tx queues from 1024 to 4096

[DPDK/ethdev Bug 1716] virtio_xmit_cleanup failed when vm rx/tx queues from 1024 to 4096

[bugzilla]

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https://bugs.dpdk.org/show_bug.cgi?id=1716

            Bug ID: 1716
           Summary: virtio_xmit_cleanup failed when vm rx/tx queues from
                    1024 to 4096
           Product: DPDK
           Version: 22.11
          Hardware: Other
                OS: All
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: updoing@sina.com
  Target Milestone: ---

Created attachment 319
  --> https://bugs.dpdk.org/attachment.cgi?id=319&action=edit
viritio patch

In a virtual machine scenario running a DPDK application with virtio drivers,
when the host machine adjusted the guest VM's transmit/receive queue size from
1024 to 4096, the DPDK application's allocated 2048 mbufs became insufficient.
After this adjustment, the condition vq->vq_nentries - vq->vq_free_thresh was
never triggered, resulting in the cleanup operation not occurring.

virtio_dev_rx_queue_setup the third param nb_desc is not used when
vq->vq_free_cnt great then nb_desc. vq->vq_free_cnt is assigned a value through
vq->n_nentries when virtio driver has inited. i40e driver vq has a nb_rx_desc
value, our dpdk app nb_desc setup 2048, malloc 2048 mbufs, so our dpdk app
rx/tx burst is failed on the line.

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