求助 mellanox connectx cx456a网卡

[crying99]

dell r730 安装ubuntu 16.0.4，安装 mellanox cx456b网卡，驱动是mellanox官方下载的，但是安装完成后用ethtool查看，显示只是40g的网卡，但是在idrac看到的的确是100g网卡，那个大神给看看，出点主意。
ethtool enp4s0f0
Settings for enp4s0f0:
Supported ports: [ FIBRE Backplane ]
Supported link modes: 10000baseKR/Full
40000baseKR4/Full
40000baseCR4/Full
40000baseSR4/Full
40000baseLR4/Full
Supported pause frame use: Symmetric
Supports auto-negotiation: Yes
Advertised link modes: 10000baseKR/Full
40000baseKR4/Full
40000baseCR4/Full
40000baseSR4/Full
40000baseLR4/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: Yes
Speed: Unknown!
Duplex: Unknown! (255)
Port: FIBRE
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Cannot get wake-on-lan settings: Operation not permitted
Current message level: 0x00000004 (4)
link
Link detected: no

*-network:0 DISABLED
description: Ethernet interface
product: MT27700 Family [ConnectX-4]
vendor: Mellanox Technologies
physical id: 0
bus info: pci@0000:04:00.0
logical name: enp4s0f0
version: 00
serial: 50:6b:4b:48:c3:12
width: 64 bits
clock: 33MHz
capabilities: pciexpress vpd msix pm bus_master cap_list rom ethernet physical fibre autonegotiation
configuration: autonegotiation=on broadcast=yes driver=mlx5_core driverversion=4.6-1.0.1 firmware=12.17.2052 (DEL3240110033)
latency=0 link=no multicast=yes port=fibre
resources: irq:68 memory:92000000-93ffffff memory:95a00000-95afffff

[astolia]

Supported link modes: 10000baseKR/Full
...
Advertised link modes: 10000baseKR/Full

这不是可以支持100g吗？