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Change API to provide io_uring struct abstraction

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This is cleaner than having the app juggle an SQ and CQ ring,
just wrap them in struct io_uring and have the API always take
that. This means the app doesn't need to worry about the different
types of rings, and that we only need to pass in one argument
for setup/teardown.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2019-01-08 15:31:35 -07:00
parent f47f24cea7
commit 7f7a66e385
3 changed files with 34 additions and 28 deletions
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13
test/io_uring-test.c
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@@ -14,8 +14,7 @@
int main(int argc, char *argv[])
{
struct io_uring_params p;
struct io_uring_sq sq;
struct io_uring_cq cq;
struct io_uring ring;
int i, fd, ring_fd, ret, pending, done;
struct io_uring_iocb *iocb;
struct io_uring_event *ev;
@@ -30,7 +29,7 @@ int main(int argc, char *argv[])
memset(&p, 0, sizeof(p));
p.flags = IORING_SETUP_IOPOLL;
ring_fd = io_uring_queue_init(4, &p, NULL, &sq, &cq);
ring_fd = io_uring_queue_init(4, &p, NULL, &ring);
if (ring_fd < 0) {
fprintf(stderr, "queue_init: %s\n", strerror(-ring_fd));
return 1;
@@ -47,7 +46,7 @@ int main(int argc, char *argv[])
offset = 0;
do {
iocb = io_uring_get_iocb(&sq);
iocb = io_uring_get_iocb(&ring);
if (!iocb)
break;
iocb->opcode = IORING_OP_READ;
@@ -60,7 +59,7 @@ int main(int argc, char *argv[])
offset += 4096;
} while (1);
ret = io_uring_submit(ring_fd, &sq);
ret = io_uring_submit(ring_fd, &ring);
if (ret < 0) {
fprintf(stderr, "io_uring_submit: %s\n", strerror(-ret));
return 1;
@@ -70,7 +69,7 @@ int main(int argc, char *argv[])
pending = ret;
for (i = 0; i < pending; i++) {
ev = NULL;
ret = io_uring_get_completion(ring_fd, &cq, &ev);
ret = io_uring_get_completion(ring_fd, &ring, &ev);
if (ret < 0) {
fprintf(stderr, "io_uring_get_completion: %s\n", strerror(-ret));
return 1;
@@ -85,6 +84,6 @@ int main(int argc, char *argv[])
printf("Submitted=%d, completed=%d\n", pending, done);
close(fd);
io_uring_queue_exit(ring_fd, &sq, &cq);
io_uring_queue_exit(ring_fd, &ring);
return 0;
}