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<p class="MsoNormal"><span lang="EN-US">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I’m deploying a c</span><span class="hgkelc"><span lang="EN">ontainerized
</span></span><span lang="EN-US">DPDK application in an OpenShift Kubernetes environment using DPDK 21.11.3.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The application uses a Mellanox ConnectX-5 100G NIC through VFs.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The problem I have is that the ETH stats counter imissed (which seems to be mapped to “out_of_buffer” internally in mlx5 PMD driver) is 0 when I don’t expect it to be, i.e. when the application doesn’t read the packets
fast enough.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Using GDB I can see that it tries to access the counter through /sys/class/infiniband/mlx5_99/ports/1/hw_counters/out_of_buffer but the hw_counters directory is missing so it will just return a zero value. I don’t know
why it is missing.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">When looking at mlx5_os_read_dev_stat() I can see that there is an alternative way of reading the counter, through mlx5_devx_cmd_queue_counter_query() but under the condition that priv->q_counters are set.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">It doesn’t get set in my case because mlx5_glue->devx_obj_create() fails (errno 22) in mlx5_devx_cmd_queue_counter_alloc().<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Have I missed something?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">NIC info:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-SE">Mellanox Technologies MT27800 Family [ConnectX-5] - 100Gb 2-port QSFP28 MCX516A-CCHT<br>
driver: mlx5_core<br>
version: 5.0-0<br>
firmware-version: 16.33.1048 (MT_0000000417)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Please let me know if I need to provide more information.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Daniel<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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