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ibm-s390-linux / s390-tools

Tools for use with the s390 Linux kernel and device drivers
MIT License
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consolidated s390 device configuration #158

Closed steffen-maier closed 7 months ago

steffen-maier commented 9 months ago

Consolidate the persistent and dynamic configuration of s390-specific devices in Linux distributions by delegating the configuration to the existing framework zdev from s390-tools.

This pull request prepares s390 device configuration in initrds built by dracut for a Linux distribution independent mechanism. Integrated in https://github.com/ibm-s390-linux/s390-tools/releases/tag/v2.31.0 (PR not merged but the individual commits were integrated).

Zdev's job is to perform low-level configuration after which the user gets architecture-independent objects such as block devices, SCSI devices, or network interfaces. Those can and should in turn be configured with existing common code mechanisms. So there's a clear separated layering for configuration duties.

In particular, the s390-specific devices currently are: DASD, ZFCP, and ZNET representing channel-attached network (QETH incl. OSA and HiperSockets, LCS, CTC). Zdev has a stable command line user interface and abstracts from sysfs and from a persistent configuration representation. Zdev encapsulates configuration details. Systems management code can simply delegate configuration to zdev and thus reduce architecture-specific code.

This improves user experience, serviceability, maintainability, and reduces test effort.

@ngueorguiev @sharkcz

steffen-maier commented 9 months ago

Even though this is a draft pull request, I would appreciate review comments. It's only a draft until we sorted out the dependencies and merge order of pull requests for different projects depending on this PR.