io_uring: add support for kernel registered bvecs

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Provide an interface for the kernel to leverage the existing
pre-registered buffers that io_uring provides. User space can reference
these later to achieve zero-copy IO.

User space must register an empty fixed buffer table with io_uring in
order for the kernel to make use of it.

Signed-off-by: Keith Busch <kbusch@kernel.org>
Link: https://lore.kernel.org/r/20250227223916.143006-5-kbusch@meta.com
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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This commit is contained in:

Keith Busch 2025-02-27 14:39:14 -08:00 • committed by Jens Axboe

parent 99fde895ff

commit 27cb27b6d5

5 changed files with 138 additions and 7 deletions

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7

include/linux/io_uring/cmd.h

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3

io_uring/io_uring.c

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123

io_uring/rsrc.c

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9

io_uring/rsrc.h

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3

io_uring/rw.c

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