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2647e2ecc0
Add a new query type IO_URING_QUERY_ZCRX returning the user some basic information about the interface, which includes allowed flags for areas and registration and supported IORING_REGISTER_ZCRX_CTRL subcodes. There is also a chicken-egg problem with user provided refill queue memory, where offsets and size information is returned after registration, but to properly allocate memory you need to know it beforehand, which is why the userspace currently has to guess the RQ headers size and severely overestimates it. Return the size information. It's split into "size" and "alignment" fields because for default placement modes the user is interested in the aligned size, however if it gets support for more flexible placement, it'll need to only know the actual header size. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
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.