Modifying rx/tx Chksums in Linux Driver Using the Xsigo Driver

To modify chksum offload to off on Linux

To turn off on the fly – but wont stay after a reboot

Firs, remove the module by running run

rmmod xve

Next, add back the module by running

modprobe xve xs_seq_file=1 xve_no_tx_checksum_offload=1
modinfo xve

For permanent set add the below highlight

cat /etc/modprobe.d/xsigo.conf
### START xsigo entries ###
options ib_mthca rdb_per_qp=64
options mlx4_core log_rdmarc_per_qp=6
options xscore xsigod_enable=1 boot_flag=0 rdma_responder_resources=64
options xsvnic xsvnic_havnic=1 xs_seq_file=1
options xve xs_seq_file=1 xve_no_tx_checksum_offload=1
### END xsigo entries ###

Then run the below (replace with your kernel version)

/opt/xsigo/bin/xsigo-hostdriver-setup --kversion 2.6.39-400.17.1.el6uek.x86_64 --ofed-version native-install

Modifying ESX chksum offload to off

To check in ESX if checksums are off

/usr/sbin/esxcfg-module -g xve
xve enabled = 1 options = ''

To modify the chksum to off

/usr/sbin/esxcfg-module -s xve_no_tx_checksum_offload=1 xve
/usr/sbin/esxcfg-module -g xve xve enabled = 1 options = 'xve_no_tx_checksum_offload=1'

Next, we need to re-load the module
First, we unload the module

vmkload_mod -u xve
Module xve successfully unloaded

To reload the module just run

vmkload_mod xve xve_no_tx_checksum_offload=1

To verify on the interface
ethtool -k 2018_pviB (assuming the interface name is 2018_pviB)

ethtool -k 2018_pviB
Offload parameters for 2018_pviB:
Cannot get device scatter-gather settings: Operation not supported
Cannot get device tcp segmentation offload settings: Operation not supported
Cannot get device udp large send offload settings: Function not implemented
Cannot get device generic segmentation offload settings: Function not implemented
rx-checksumming: off
tx-checksumming: off
scatter-gather: off
tcp segmentation offload: off
udp fragmentation offload: off
generic segmentation offload: off
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