Brocade Virtual ADX Installation and Deployment Guide (Supporting ADX v03.1.00) - Manual (Page 40)

NOTE
For details of where checksum calculation is performed, when virtual and physical NICs have different
TCP checksum offload settings, refer to the hypervisor documentation.
Incoming packets
TCP checksum offload may be applied to incoming packets.
SR-IOV
Use the ixgbevf driver which supports incoming packet checksum offload.
When checksum verification is not performed by the virtual network adaptor, the Brocade Virtual ADX
software does the checksum verification.
Non SR-IOV
By default, TCP checksum offload is disabled and checksum calculation is performed by the Brocade
Virtual ADX software.
Outgoing packets
By default, TCP checksum offload is disabled and checksum calculation is performed by the Brocade
Virtual ADX software.
Enabling or disabling TCP checksum offload
Ensure that your network adaptor supports checksum offload prior to enabling TCP checksum offload.
1. Enter the configure command to access global configuration mode.
Virtual ADX# configure terminal
2. Use the following command to enable TCP checksum offload.
Virtual ADX(config)# server hw-csum-offload
Incoming packets
40 Brocade Virtual ADX Installation and Deployment Guide
53-1003241-01