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Different drivers support different features and even subset of the common uverbs implementation. Currently, this is handled as bitmask in every driver that represents which kind of methods it supports, but doesn't go down to attributes granularity. Moreover, drivers might want to add their specific types, methods and attributes to let their user-space counter-parts be exposed to some more efficient abstractions. It means that existence of different features is validated syntactically via the parsing infrastructure rather than using a complex in-handler logic. In order to do that, we allow defining features and abstractions as parsing trees. These per-feature parsing tree could be merged to an efficient (perfect-hash based) parsing tree, which is later used by the parsing infrastructure. To sum it up, this makes a parse tree unique for a device and represents only the features this particular device supports. This is done by having a root specification tree per feature. Before a device registers itself as an IB device, it merges all these trees into one parsing tree. This parsing tree is used to parse all user-space commands. A future user-space application could read this parse tree. This tree represents which objects, methods and attributes are supported by this device. This is based on the idea of Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.