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From: Rajesh Kumar <rajeshthepro@gmail.com>
Date: Tue, 22 Dec 2020 15:07:18 +0530
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Subject: [dpdk-dev] net/ena: traffic lock
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Dpdk: 19.11

Driver: ena



During longevity(after 24+ hrs) testing at 10Gbps, one of tx-queue is
getting into unrecoverable state ( its not able to find enough
tx-descriptor nor its freeing up).



So for every tx-burst, eth_ena_xmit_pkts() neither finds free tx-descriptor
nor able to free txd (ena_com_tx_comp_req_id_get() is always returning
ENA_COM_TRY_AGAIN).



We see eth_ena_xmit_pkts() has been refactored in latest LTS version, is
there any related issue got fixed ? Can you help





(gdb) p *(struct ena_ring *) rte_eth_devices[2].data->tx_queues[5]

$14 =3D {

  next_to_use =3D 4979,

  next_to_clean =3D 3958,

  type =3D ENA_RING_TYPE_TX,

  tx_mem_queue_type =3D ENA_ADMIN_PLACEMENT_POLICY_DEV,

  {

    empty_tx_reqs =3D 0x11e406b00,

    empty_rx_reqs =3D 0x11e406b00

  },

  {

    tx_buffer_info =3D 0x11d2dfc80,

    rx_buffer_info =3D 0x11d2dfc80

  },

 rx_refill_buffer =3D 0x0,

  ring_size =3D 1024,

  ena_com_io_cq =3D 0x11e40e640,

  ena_com_io_sq =3D 0x11e4168c0,

  ena_bufs =3D {{

      len =3D 0,

      req_id =3D 0

    } <repeats 17 times>},

  mb_pool =3D 0x0,

  port_id =3D 2,

  id =3D 5,

  tx_max_header_size =3D 96 '`',

 configured =3D 1,

  push_buf_intermediate_buf =3D 0x11e406a00 "",

  adapter =3D 0x11e40e040,

  offloads =3D 2,

  sgl_size =3D 17,

  {

    rx_stats =3D {

      cnt =3D 4979,

      bytes =3D 417580,

      refill_partial =3D 35426,

      bad_csum =3D 0,

      mbuf_alloc_fail =3D 0,

      bad_desc_num =3D 38603,

---Type <return> to continue, or q <return> to quit---

      bad_req_id =3D 3178

    },

    tx_stats =3D {

      cnt =3D 4979,

      bytes =3D 417580,

      prepare_ctx_err =3D 35426, =C3=9F Errors

      linearize =3D 0,

      linearize_failed =3D 0,

      tx_poll =3D 38603,

      doorbells =3D 3178,

      bad_req_id =3D 0,

      available_desc =3D 2 <<-- No free descriptor

    }

  },

  numa_socket_id =3D 0

}



Thanks,

*-Rajesh*