Turning outbound checksum calculations on and off

6.10 LPAR mode z/VM guest

The qeth device driver supports offloading outbound (transmit) checksum calculations to the OSA feature.

About this task

You can enable or disable the OSA feature calculating the transmit checksums by using the ethtool command.

Issue a command of the form:

# ethtool -K <interface_name> tx <value>

where <value> is on or off.

To let the OSA feature calculate the transmit checksum for network device eth0, issue
```
# ethtool -K eth0 tx on
```
To let the host CPU calculate the transmit checksum for network device eth0, issue
```
# ethtool -K eth0 tx off
```