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？