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io_uring: add support for 128-byte SQEs

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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>
This commit is contained in:
Jens Axboe
2022-03-31 19:27:52 -06:00
parent b5ba65df47
commit ebdeb7c01d
2 changed files with 19 additions and 3 deletions
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8
include/uapi/linux/io_uring.h
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@@ -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,