不能禁用自动装置(如通过伦理工具)

Question

我想禁用NIC的auto-negotiation特性，我运行以下命令

$sudo ethtool -s ens1f0 speed 10000 duplex full autoneg off

然后，我检查它是否通过ethtool ens1f0生效：

Settings for ens1f0:
        Supported ports: [ FIBRE ]
        Supported link modes:   1000baseT/Full
                                10000baseT/Full
        Supported pause frame use: Symmetric
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  10000baseT/Full
        Advertised pause frame use: Symmetric
        Advertised auto-negotiation: Yes
        Advertised FEC modes: Not reported
        Speed: 10000Mb/s
        Duplex: Full
        Port: FIBRE
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
Cannot get wake-on-lan settings: Operation not permitted
        Current message level: 0x00000007 (7)
                               drv probe link
        Link detected: yes

autoneg还在运行，为什么不能工作？

更新2020/8/22

我的网卡是82599ES 10-Gigabit SFI/SFP+ Network Connection 10fb，我发现在某些情况下，10GBASE-T链接的auto-neg功能可以关闭。

1. 奇怪的是，NIC的两个端口具有不同的autoneg状态。我真的很困惑。

Settings for ens1f0:
        Supported ports: [ FIBRE ]
        Supported link modes:   1000baseT/Full
                                10000baseT/Full
        Supported pause frame use: Symmetric
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  1000baseT/Full
                                10000baseT/Full
        Advertised pause frame use: Symmetric
        Advertised auto-negotiation: Yes
        Advertised FEC modes: Not reported
        Speed: 10000Mb/s
        Duplex: Full
        Port: FIBRE
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
Cannot get wake-on-lan settings: Operation not permitted
        Current message level: 0x00000007 (7)
                               drv probe link
        Link detected: yes

Settings for ens1f1:
        Supported ports: [ FIBRE ]
        Supported link modes:   10000baseT/Full
        Supported pause frame use: Symmetric
        Supports auto-negotiation: No
        Supported FEC modes: Not reported
        Advertised link modes:  10000baseT/Full
        Advertised pause frame use: Symmetric
        Advertised auto-negotiation: No
        Advertised FEC modes: Not reported
        Speed: 10000Mb/s
        Duplex: Full
        Port: FIBRE
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: off
Cannot get wake-on-lan settings: Operation not permitted
        Current message level: 0x00000007 (7)
                               drv probe link
        Link detected: yes

1. 当端口不与对等端连接时，autoneg将关闭。

Settings for ens1f1:
        Supported ports: [ FIBRE ]
        Supported link modes:   10000baseT/Full
        Supported pause frame use: Symmetric
        Supports auto-negotiation: No
        Supported FEC modes: Not reported
        Advertised link modes:  10000baseT/Full
        Advertised pause frame use: Symmetric
        Advertised auto-negotiation: No
        Advertised FEC modes: Not reported
        Speed: Unknown!
        Duplex: Unknown! (255)
        Port: Other
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: off
Cannot get wake-on-lan settings: Operation not permitted
        Current message level: 0x00000007 (7)
                               drv probe link
        Link detected: no

Answer 1

不可能在10 10GBASE链接上禁用自动协商。802.3标准表示此类链接的自动谈判是强制性的。其中一些原因包括：

55.6.1对自动谈判的支持所有10 10GBASE PHYs应为自动协商提供支持(第28条)，并应能作为主从操作。所有10 10GBASE PHYs都应支持28.2.3.4.2中定义的扩展的下一页，并支持和使用28.2.1.1.1中定义的优化后的FLP突发定时，以及28.3.2中定义的nlp_link_test_min_timer和link_fail_inhibit_timer。自动协商是链路初始设置的一部分，允许两端的PHYs宣传其功能(速度、PHY类型、半双工或全双工)，并自动选择在链路上进行通信的操作模式。自动协商信令用于10 10GBASE的下列主要用途：

• 协商PHY有能力支持10 10GBASE传输。
• 以确定链接两端的PHYs之间的主从关系。
• 以确定本地PHY是否执行PMA训练模式重置。
• 以确定本地PHY是否支持EEE功能。
• 以确定本地PHY是否支持快速再培训能力。