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<p class="MsoNormal">Hi DPDK Community,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I'm currently working with dpdk-22.11 ( also tried current 24.07) and facing an issue when initializing 2×25G Mellanox NICs (MT27800 Family [ConnectX-5]) on ARM based system.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">During device probing, I see the following errors:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:red">EAL: Probe PCI driver: mlx5_pci (15b3:1017) device: 0001:01:00.0 (socket -1)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:red">mlx5_common: Failed to allocate DevX UAR (BF/NC)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:red">mlx5_common: Failed to allocate UAR.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:red">mlx5_net: Failed to prepare Tx DevX UAR.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:red">mlx5_net: probe of PCI device 0001:01:00.0 aborted after encountering an error: Operation not permitted<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Interestingly, the same setup works fine with 2×100G MT28800 Family [ConnectX-5 Ex] NICs.
<o:p></o:p></p>
<p class="MsoNormal">Also this 2x25G cards work well with Linux kernel. The issue is only with DPDK binding.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When I enable kernel prints, UAR allocation appears successful, suggesting the issue may be DevX-specific on MT27800.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I'd appreciate any guidance on:<o:p></o:p></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoNormal" style="mso-list:l0 level1 lfo1">Known limitations or configuration differences between MT27800 and MT28800<o:p></o:p></li><li class="MsoNormal" style="mso-list:l0 level1 lfo1">Whether DevX should be disabled explicitly for MT27800 (e.g., MLX5_DEVX=0)<o:p></o:p></li><li class="MsoNormal" style="mso-list:l0 level1 lfo1">Any firmware or kernel dependencies that might affect DevX support<o:p></o:p></li></ul>
<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
<p class="MsoNormal">Thanks in advance for your help.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best Regards,<o:p></o:p></p>
<p class="MsoNormal">Prashant Gupta<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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