Hello,
I have two Mellanox card, with two Supermicro servers with Ubuntu Server 18.04.3, I am trying to connect them as crossover with qspf+ 40Gb cable, but I got only 10Gb connections.
at the same time when I am connecting both cards to Cisco switch I am getting 40Gb connections.
Also as loop (port to port) at the same card I can connect ConnectX3 but again getting only 10Gb connection.
But when I am trying to connect ConnectX4 NEtwork is not working at all, and at syslog I getting errors as [mlx5 core cable error, unknown identifier]
And difference in ethtool report
With connection to Cisco Switch:
Supported ports: [ FIBRE ]
Supported link modes: 1000baseKX/Full
10000baseKX4/Full
10000baseKR/Full
40000baseCR4/Full
40000baseSR4/Full
56000baseCR4/Full
56000baseSR4/Full
Supported pause frame use: Symmetric Receive-only
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 1000baseKX/Full
10000baseKX4/Full
10000baseKR/Full
40000baseCR4/Full
40000baseSR4/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Link partner advertised link modes: 40000baseCR4/Full
Link partner advertised pause frame use: No
Link partner advertised auto-negotiation: Yes
Link partner advertised FEC modes: Not reported
Speed: 40000Mb/s
Duplex: Full
Port: Direct Attach Copper
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: d
Wake-on: d
Current message level: 0x00000014 (20)
link ifdown
Link detected: yes
With Connection as crossover ConnectX3 to ConnectX4
Supported ports: [ FIBRE ]
Supported link modes: 1000baseKX/Full
10000baseKX4/Full
10000baseKR/Full
40000baseCR4/Full
40000baseSR4/Full
56000baseCR4/Full
56000baseSR4/Full
Supported pause frame use: Symmetric Receive-only
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 1000baseKX/Full
10000baseKX4/Full
10000baseKR/Full
40000baseCR4/Full
40000baseSR4/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Speed: 10000Mb/s
Duplex: Full
Port: Direct Attach Copper
PHYAD: 0
Transceiver: internal
Auto-negotiation: off
Supports Wake-on: d
Wake-on: d
Current message level: 0x00000014 (20)
link ifdown
Link detected: yes
Can I emulate this (Link partner advertised link modes: 40000baseCR4/Full ) while connecting as crossover??
Thank you very much