General Related Troubleshooting

Link down

The link might be down due to one of the following issues:

• cable issues,
• unsupported speeds,
• configuration issues

Run mlx5cmd -dbg -pddrinfo and check the following lines in the output presented:

• Troubleshooting Info:
  • Messages: Indicates the issue that requires attention.
• Operational Info:
  • Active link speed: The active speed displayed in bit mask. The list of bits are stated below.
  • Supported speeds: The supported speed displayed in bit mask. The list of bits are stated below.

 Ethernet:

• 100GB: Bits 23-20
• 56GB: Bit 8
• 50GB: Bits 31-30; 19-18
• 40GB: Bits 16-15; 7
• 25GB: Bits 29-28
• 20GB: Bit 5
• 10GB: Bits 14-12; 4-2
• 1G: Bit 1

 InfiniBand:

• Bit 0: SDR
• Bit 1: DDR
• Bit 2: QDR
• Bit 4: FDR