Re: [PATCH liburing] tests: test CQE ordering on early submission fail

[Pavel Begunkov <asml.silence@gmail.com>]

On 30/03/2021 11:26, Pavel Begunkov wrote:
> Check that CQEs of a link comes in the order of submission, even when
> a link fails early during submission initial prep.

up

> 
> Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
> ---
>  test/link.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 53 insertions(+)
> 
> diff --git a/test/link.c b/test/link.c
> index c89d6b2..fadd0b5 100644
> --- a/test/link.c
> +++ b/test/link.c
> @@ -429,6 +429,53 @@ err:
>  	return 1;
>  }
>  
> +static int test_link_fail_ordering(struct io_uring *ring)
> +{
> +	struct io_uring_cqe *cqe;
> +	struct io_uring_sqe *sqe;
> +	int ret, i, nr_compl;
> +
> +	sqe = io_uring_get_sqe(ring);
> +	io_uring_prep_nop(sqe);
> +	sqe->flags |= IOSQE_IO_LINK;
> +	sqe->user_data = 0;
> +
> +	sqe = io_uring_get_sqe(ring);
> +	io_uring_prep_write(sqe, -1, NULL, 100, 0);
> +	sqe->flags |= IOSQE_IO_LINK;
> +	sqe->user_data = 1;
> +
> +	sqe = io_uring_get_sqe(ring);
> +	io_uring_prep_nop(sqe);
> +	sqe->flags |= IOSQE_IO_LINK;
> +	sqe->user_data = 2;
> +
> +	nr_compl = ret = io_uring_submit(ring);
> +	/* at least the first nop should have been submitted */
> +	if (ret < 1) {
> +		fprintf(stderr, "sqe submit failed: %d\n", ret);
> +		goto err;
> +	}
> +
> +	for (i = 0; i < nr_compl; i++) {
> +		ret = io_uring_wait_cqe(ring, &cqe);
> +		if (ret) {
> +			fprintf(stderr, "wait completion %d\n", ret);
> +			goto err;
> +		}
> +		if (cqe->user_data != i) {
> +			fprintf(stderr, "wrong CQE order, got %i, expected %i\n",
> +					(int)cqe->user_data, i);
> +			goto err;
> +		}
> +		io_uring_cqe_seen(ring, cqe);
> +	}
> +
> +	return 0;
> +err:
> +	return 1;
> +}
> +
>  int main(int argc, char *argv[])
>  {
>  	struct io_uring ring, poll_ring;
> @@ -492,5 +539,11 @@ int main(int argc, char *argv[])
>  		return ret;
>  	}
>  
> +	ret = test_link_fail_ordering(&ring);
> +	if (ret) {
> +		fprintf(stderr, "test_link_fail_ordering last failed\n");
> +		return ret;
> +	}
> +
>  	return 0;
>  }
> 

-- 
Pavel Begunkov