Mellanox ConnectX-5 Physical state Polling

I have two ConnectX-5 direct connect each other but the physical state shows Polling. It seems the mlx related drivers are loaded correctly. I’m new to IB. What did I miss? Thanks.

$ ibstat

CA ‘mlx5_1’

CA type: MT4119

Number of ports: 1

Firmware version: 16.27.1016

Hardware version: 0

Node GUID: 0x98039b0300862f75

System image GUID: 0x98039b0300862f74

Port 1:

State: Down

Physical state: Polling

Rate: 10

Base lid: 65535

LMC: 0

SM lid: 0

Capability mask: 0x2651e848

Port GUID: 0x98039b0300862f75

Link layer: InfiniBand

$ lsmod | grep mlx

mlx5_ib 410355 0

mlx5_core 1073216 1 mlx5_ib

mlxfw 19917 1 mlx5_core

ib_uverbs 141173 10 mlx5_ib,rdma_ucm

ib_core 377570 8 ib_cm,rdma_cm,ib_umad,ib_uverbs,ib_ipoib,iw_cm,mlx5_ib,rdma_ucm

mlx_compat 45899 10 ib_cm,rdma_cm,ib_umad,ib_core,ib_uverbs,ib_ipoib,mlx5_core,iw_cm,mlx5_ib,rdma_ucm

I was able to solve it by first upgrading the firmware and then loading opensm. The link state becomes “Active” and physical state “LinkUp”. My question is the card and cable should support 100Gbps but why “Rate” shows 10?

CA ‘mlx5_1’

CA type: MT4119

Number of ports: 1

Firmware version: 16.30.1004

Hardware version: 0

Node GUID: 0x98039b03008f93bd

System image GUID: 0x98039b03008f93bc

Port 1:

State: Active

Physical state: LinkUp

Rate: 10

Base lid: 1

LMC: 0

SM lid: 2

Capability mask: 0x2651e84a

Port GUID: 0x98039b03008f93bd

Link layer: InfiniBand

Somehow I had to run mlxconfig to explicitly set link type to Ethernet then I’m able to get 100Gbps data rate. And if I set link type back to Infiniband it goes 10Gbps again. Is this what Mellanox card/software by design?

Hello Colin,

Thank you for posting your inquiry on the NVIDIA Networking Community.

Based on the updates your were able to start the Subnet Manager, which is needed in every IB fabric.

You need to run the SM on one node only if connected back2back. As you mentioned you were able to get a rate of 100GbE, suspicion is that you are using an Ethernet cable. For achieving 100Gb/s IB, you need to use the correct cable. You can find the list of supported IB cables through the RN of the f/w on the adapter →

Thank you and regards,

~NVIDIA Networking Technical Support

Thank you Martijn. I will get one of the IB cables and try again.

Yes, you’re right. it is cable. Once I change to IB cable rate becomes 100. Thanks!