Cannot set device tcp segmentation offload settings: Invalid argument

错误描述

ethtool -K eth0 tso on

Cannot set device tcp segmentation offload settings: Invalid argument

TSO选项开启失败。

网卡驱动

显示网卡驱动

ethtool -i | --driver ethX

例：ethtool -i eth0

driver: tg3

version: 3.122n

firmware-version: 5752-v3.19

bus-info: 0000:0b:00.0

例：ethtool -i eth0

driver: e1000

version: 7.3.21-k4-NAPI

firmware-version: N/A

bus-info: 0000:03:06.0

intel的e1000

drivers/ net/ ethernet/ intel/ e1000/ e1000_main.c

broadcom的tg3

drivers/ net/ ethernet/ broadcom/ tg3.h

drivers/ net/ ethernet/ broadcom/ tg3.c

网卡型号

PCI (Peripheral Component Interconnect)，外围部件互联总线。

lspci — list all PCI devices

例：lspci -vvv | grep Ethernet

0b:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5752 Gigabit Ethernet PCI Express (rev 02)

网卡为Broadcom的千兆网卡，型号为BCM5752。

解决过程

找台能正常设置TSO的机器，依次检查和对比：

1. 网卡类型 - support TSO

2. 网卡驱动 - support TSO

3. ethtool - support TSO

4. 内核版本 - support TSO

5. 依赖关系 - 问题出在这里！

A driver that wants to offer TSO needs to set the NETIF_F_TSO bit in the network structure.

In oder for a device to support TSO, it needs to also support TCP_checksum_offloading and

Scatter_Gather.

想要使用TSO，必须确保：

ethtool -K eth0 tx on // specifies whether TX checksumming should be enabled.

ethtool -K eth0 sg on // specifies whether scatter-gather should be enabled.

ethtool -K eth0 tso on // specifies whether TCP segmentation offload should be eabled.

这三者缺一不可，而出现"Cannot set device tcp segmentation offload settings: Invalid argument"的原因

就是没有事先启用scatter-gather选项。