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Subject[PATCH liburing] Test wait after under-consuming
Date
In case of an error submission won't consume all sqes. This tests that
it will get back to the userspace even if (to_submit == to_wait)

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
test/link.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 55 insertions(+), 1 deletion(-)

diff --git a/test/link.c b/test/link.c
index 8ec1649..93653f3 100644
--- a/test/link.c
+++ b/test/link.c
@@ -384,6 +384,55 @@ err:
return 1;
}

+static int test_early_fail_and_wait(struct io_uring *ring)
+{
+ struct io_uring_cqe *cqe;
+ struct io_uring_sqe *sqe;
+ int ret, submitted, i;
+ const int invalid_fd = 42;
+ struct iovec iov = { .iov_base = NULL, .iov_len = 0 };
+
+ sqe = io_uring_get_sqe(ring);
+ if (!sqe) {
+ printf("get sqe failed\n");
+ goto err;
+ }
+
+ io_uring_prep_readv(sqe, invalid_fd, &iov, 1, 0);
+ sqe->user_data = 1;
+ sqe->flags |= IOSQE_IO_LINK;
+
+ sqe = io_uring_get_sqe(ring);
+ if (!sqe) {
+ printf("get sqe failed\n");
+ goto err;
+ }
+
+ io_uring_prep_nop(sqe);
+ sqe->user_data = 2;
+
+ submitted = io_uring_submit_and_wait(ring, 2);
+ if (submitted == -EAGAIN)
+ return 0;
+ if (submitted <= 0) {
+ printf("sqe submit failed: %d\n", submitted);
+ goto err;
+ }
+
+ for (i = 0; i < 2; i++) {
+ ret = io_uring_wait_cqe(ring, &cqe);
+ if (ret < 0) {
+ printf("wait completion %d\n", ret);
+ 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;
@@ -400,7 +449,6 @@ int main(int argc, char *argv[])
if (ret) {
printf("poll_ring setup failed\n");
return 1;
-
}

ret = test_single_link(&ring);
@@ -439,5 +487,11 @@ int main(int argc, char *argv[])
return ret;
}

+ ret = test_early_fail_and_wait(&ring);
+ if (ret) {
+ fprintf(stderr, "test_early_fail_and_wait\n");
+ return ret;
+ }
+
return 0;
}
--
2.24.0
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