如何设置服务器网卡千兆变万兆

现在测试服务器有 3 个网卡，一个千兆，两个万兆自适应，如下：

# lspci  -tv
-[0000:00]-+-00.0  Intel Corporation 5000X Chipset Memory Controller Hub
           +-02.0-[04-09]--+-00.0-[05-08]--+-00.0-[06-07]----00.0-[07]----00.0  Broadcom Corporation NetXtreme II BCM5708 Gigabit Ethernet
           |               |               \-01.0-[08]--
           |               \-00.3-[09]--
           +-03.0-[01]----00.0  LSI Logic / Symbios Logic SAS1068E PCI-Express Fusion-MPT SAS
           +-04.0-[0a]--+-00.0  Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection
           |            \-00.1  Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection
           +-05.0-[0b]--
           +-06.0-[0c]--+-00.0  Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection
           |            \-00.1  Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection

两个万兆口通过光纤直连，千兆口与外网通信。

其中一个万兆口的设置如下：

# ethtool eth2
Settings for eth2:
        Supported ports: [ FIBRE ]
        Supported link modes:   1000baseT/Full 
                                10000baseT/Full 
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Advertised link modes:  1000baseT/Full 
        Advertised pause frame use: No
        Advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: FIBRE
        PHYAD: 0
        Transceiver: external
        Auto-negotiation: on
        Supports Wake-on: d
        Wake-on: d
        Current message level: 0x00000007 (7)
                               drv probe link

可以看到当前速率是 1000Mb ，这是测试发包没问题，基本达到 1000M 的线速

Speed: 1.420 Mpps Bandwidth: 727.219 Mbps (raw 999.926 Mbps). Average batch: 256.20 pkts

我想让他变成 10000Mb ，使用

ethtool -s eth0 autoneg off speed 10000 duplex full

# ethtool eth2
Settings for eth2:
        Supported ports: [ FIBRE ]
        Supported link modes:   1000baseT/Full 
                                10000baseT/Full 
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Advertised link modes:  10000baseT/Full 
        Advertised pause frame use: No
        Advertised auto-negotiation: Yes
        Speed: Unknown!
        Duplex: Unknown! (255)
        Port: FIBRE
        PHYAD: 0
        Transceiver: external
        Auto-negotiation: on
        Supports Wake-on: d
        Wake-on: d
        Current message level: 0x00000007 (7)
                               drv probe link
        Link detected: no

speed 变成了 Unknown ，测试发包会报错。因为驱动也是 ixgbe ，我想问下如何让这里的千兆变成万兆？