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How to configure cards to run at 25Gbs

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Hello,

I have two Mellanox ConnectX-4 Lx cards connected back-to-back between two servers.  Unfortunately, they are running at 10Gbps.  I've tried ethtool to configure/force them to 25000 but that didn't work.  Hosts are both Ubuntu 14.04, w/ 4.4 kernel and OFED-3.4-1.0.0 running.

The command I used was: 'sudo ethtool -s eth2 speed 25000 autoneg off' on both servers, but then I couldn't even ping.

 

The card is stated to support 25GbE but I couldn't find any documentation (other than the ethtool command to try and set the speed) about configuring the cards to run at 25GbE.

 

Here is the output of lspci:

01:00.0 Ethernet controller: Mellanox Technologies MT27710 Family [ConnectX-4 Lx]

01:00.1 Ethernet controller: Mellanox Technologies MT27710 Family [ConnectX-4 Lx]

 

And the output from: 'sudo mlxfwmanager --query':

Device #1:

----------

  Device Type:      ConnectX4LX

  Part Number:      MCX4121A-ACA_Ax

  Description:      ConnectX-4 Lx EN network interface card; 25GbE dual-port SFP28; PCIe3.0 x8; ROHS R6

  PSID:             MT_2420110034

  PCI Device Name:  /dev/mst/mt4117_pciconf0

  Base MAC:         0000248a07114f90

  Versions:         Current        Available

     FW             14.17.1010     N/A

     PXE            3.4.0903       N/A

  Status:           No matching image found

 

And finally 'sudo ethtool eth2' (Is 25000 not a supported link mode?):

Settings for eth2:

        Supported ports: [ FIBRE ]

        Supported link modes:   1000baseT/Full

                                1000baseKX/Full

                                10000baseKR/Full

        Supported pause frame use: Symmetric Receive-only

        Supports auto-negotiation: Yes

        Advertised link modes:  1000baseT/Full

                                10000baseKR/Full

        Advertised pause frame use: No

        Advertised auto-negotiation: Yes

        Link partner advertised link modes:  Not reported

        Link partner advertised pause frame use: No

        Link partner advertised auto-negotiation: Yes

        Speed: 10000Mb/s

        Duplex: Full

        Port: Direct Attach Copper

        PHYAD: 0

        Transceiver: internal

        Auto-negotiation: on

        Supports Wake-on: d

        Wake-on: d

        Current message level: 0x00000004 (4)

                               link

        Link detected: yes

 

 

Any help would be greatly appreciated!

 

- Curt


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