Turning inbound checksum calculations on and off

A checksum calculation is a form of redundancy check to protect the integrity of data. In general, checksum calculations are used for network data.

Procedure

The qeth device driver supports offloading checksum calculations on inbound packets to the OSA feature.

To enable or disable checksum calculations by the OSA feature, issue a command of this form:

# ethtool -K <interface_name> rx <value>

where <value> is on or off.

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