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| author |   Jens Axboe <axboe@kernel.dk> | 2022-03-31 19:27:52 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-05-09 06:35:33 -0600 |
| commit | ebdeb7c01d025cb059f05dc26b9dc914e46dd43f (patch) | |
| tree | 277d08ae7ef441660c3287eba92195b05becea9d /include/uapi | |
| parent | Merge branch 'for-5.19/io_uring-socket' into for-5.19/io_uring-passthrough (diff) | |
| download | linux-dev-ebdeb7c01d025cb059f05dc26b9dc914e46dd43f.tar.xz linux-dev-ebdeb7c01d025cb059f05dc26b9dc914e46dd43f.zip | |
io_uring: add support for 128-byte SQEs
Normal SQEs are 64-bytes in length, which is fine for all the commands
we support. However, in preparation for supporting passthrough IO,
provide an option for setting up a ring with 128-byte SQEs.
We continue to use the same type for io_uring_sqe, it's marked and
commented with a zero sized array pad at the end. This provides up
to 80 bytes of data for a passthrough command - 64 bytes for the
extra added data, and 16 bytes available at the end of the existing
SQE.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/uapi')
| -rw-r--r-- | include/uapi/linux/io_uring.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 31e719f38615..ee84132cadad 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -63,6 +63,12 @@ struct io_uring_sqe { }; __u64 addr3; __u64 __pad2[1]; + + /* + * If the ring is initialized with IORING_SETUP_SQE128, then this field + * contains 64-bytes of padding, doubling the size of the SQE. + */ + __u64 __big_sqe_pad[0]; }; enum { @@ -119,6 +125,8 @@ enum { */ #define IORING_SETUP_TASKRUN_FLAG (1U << 9) +#define IORING_SETUP_SQE128 (1U << 10) /* SQEs are 128 byte */ + enum io_uring_op { IORING_OP_NOP, IORING_OP_READV, |