diff options
| author | Keith Busch <kbusch@kernel.org> | 2025-02-27 14:39:14 -0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2025-02-28 07:05:36 -0700 |
| commit | 27cb27b6d5ea401143ca3648983342bb820c4be9 (patch) | |
| tree | 57e120597af207b8d4d83502d0f6353d3ab6bd34 /include | |
| parent | nvme: map uring_cmd data even if address is 0 (diff) | |
| download | linux-27cb27b6d5ea401143ca3648983342bb820c4be9.tar.gz linux-27cb27b6d5ea401143ca3648983342bb820c4be9.zip | |
io_uring: add support for kernel registered bvecs
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/io_uring/cmd.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/io_uring/cmd.h b/include/linux/io_uring/cmd.h index 87150dc0a07c..cf8d80d84734 100644 --- a/include/linux/io_uring/cmd.h +++ b/include/linux/io_uring/cmd.h @@ -4,6 +4,7 @@ #include <uapi/linux/io_uring.h> #include <linux/io_uring_types.h> +#include <linux/blk-mq.h> /* only top 8 bits of sqe->uring_cmd_flags for kernel internal use */ #define IORING_URING_CMD_CANCELABLE (1U << 30) @@ -125,4 +126,10 @@ static inline struct io_uring_cmd_data *io_uring_cmd_get_async_data(struct io_ur return cmd_to_io_kiocb(cmd)->async_data; } +int io_buffer_register_bvec(struct io_uring_cmd *cmd, struct request *rq, + void (*release)(void *), unsigned int index, + unsigned int issue_flags); +void io_buffer_unregister_bvec(struct io_uring_cmd *cmd, unsigned int index, + unsigned int issue_flags); + #endif /* _LINUX_IO_URING_CMD_H */ |