Recently, Linux kernel 4.18 was released.
For Linux on Z, it provides the base set of functionality and features for remote Shared Memory Communications (SMC-R), including compatibility with z/OS. Beside SMC-R, support for IPv6 checksum offload was added to the qeth device driver. You can control offload settings with the ethtool utility.
You can obtain the Linux kernel 4.18 here or its latest stable release at kernel.org. The corresponding s390-tools version is 2.6.0.
See also the documentation on developerWorks, for example, the Device Drivers, Features, and Commands edition for Linux kernel 4.18.
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