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/* SPDX-License-Identifier: MIT */
/*
* Description: run timeout overflow test
*
*/
#include <errno.h>
#include <stdio.h>
#include <limits.h>
#include <string.h>
#include <sys/time.h>
#include "liburing.h"
#define TIMEOUT_MSEC 200
static int not_supported;
static void msec_to_ts(struct __kernel_timespec *ts, unsigned int msec)
{
ts->tv_sec = msec / 1000;
ts->tv_nsec = (msec % 1000) * 1000000;
}
static int check_timeout_support(void)
{
struct io_uring_sqe *sqe;
struct io_uring_cqe *cqe;
struct __kernel_timespec ts;
struct io_uring_params p;
struct io_uring ring;
int ret;
memset(&p, 0, sizeof(p));
ret = io_uring_queue_init_params(1, &ring, &p);
if (ret) {
fprintf(stderr, "ring setup failed: %d\n", ret);
return 1;
}
/* not really a match, but same kernel added batched completions */
if (p.features & IORING_FEAT_POLL_32BITS) {
fprintf(stdout, "Skipping\n");
not_supported = 1;
return 0;
}
sqe = io_uring_get_sqe(&ring);
msec_to_ts(&ts, TIMEOUT_MSEC);
io_uring_prep_timeout(sqe, &ts, 1, 0);
ret = io_uring_submit(&ring);
if (ret < 0) {
fprintf(stderr, "sqe submit failed: %d\n", ret);
goto err;
}
ret = io_uring_wait_cqe(&ring, &cqe);
if (ret < 0) {
fprintf(stderr, "wait completion %d\n", ret);
goto err;
}
if (cqe->res == -EINVAL) {
not_supported = 1;
fprintf(stdout, "Timeout not supported, ignored\n");
return 0;
}
io_uring_cqe_seen(&ring, cqe);
io_uring_queue_exit(&ring);
return 0;
err:
io_uring_queue_exit(&ring);
return 1;
}
/*
* We first setup 4 timeout requests, which require a count value of 1, 1, 2,
* UINT_MAX, so the sequence is 1, 2, 4, 2. Before really timeout, this 4
* requests will not lead the change of cq_cached_tail, so as sq_dropped.
*
* And before this patch. The order of this four requests will be req1->req2->
* req4->req3. Actually, it should be req1->req2->req3->req4.
*
* Then, if there is 2 nop req. All timeout requests expect req4 will completed
* successful after the patch. And req1/req2 will completed successful with
* req3/req4 return -ETIME without this patch!
*/
static int test_timeout_overflow(void)
{
struct io_uring_sqe *sqe;
struct io_uring_cqe *cqe;
struct __kernel_timespec ts;
struct io_uring ring;
int i, ret;
ret = io_uring_queue_init(16, &ring, 0);
if (ret) {
fprintf(stderr, "ring setup failed: %d\n", ret);
return 1;
}
msec_to_ts(&ts, TIMEOUT_MSEC);
for (i = 0; i < 4; i++) {
unsigned num = 0;
sqe = io_uring_get_sqe(&ring);
switch (i) {
case 0:
case 1:
num = 1;
break;
case 2:
num = 2;
break;
case 3:
num = UINT_MAX;
break;
}
io_uring_prep_timeout(sqe, &ts, num, 0);
}
for (i = 0; i < 2; i++) {
sqe = io_uring_get_sqe(&ring);
io_uring_prep_nop(sqe);
io_uring_sqe_set_data(sqe, (void *) 1);
}
ret = io_uring_submit(&ring);
if (ret < 0) {
fprintf(stderr, "sqe submit failed: %d\n", ret);
goto err;
}
i = 0;
while (i < 6) {
ret = io_uring_wait_cqe(&ring, &cqe);
if (ret < 0) {
fprintf(stderr, "wait completion %d\n", ret);
goto err;
}
/*
* cqe1: first nop req
* cqe2: first timeout req, because of cqe1
* cqe3: second timeout req because of cqe1 + cqe2
* cqe4: second nop req
* cqe5~cqe6: the left three timeout req
*/
switch (i) {
case 0:
case 3:
if (io_uring_cqe_get_data(cqe) != (void *) 1) {
fprintf(stderr, "nop not seen as 1 or 2\n");
goto err;
}
break;
case 1:
case 2:
case 4:
if (cqe->res == -ETIME) {
fprintf(stderr, "expected not return -ETIME "
"for the #%d timeout req\n", i - 1);
goto err;
}
break;
case 5:
if (cqe->res != -ETIME) {
fprintf(stderr, "expected return -ETIME for "
"the #%d timeout req\n", i - 1);
goto err;
}
break;
}
io_uring_cqe_seen(&ring, cqe);
i++;
}
return 0;
err:
return 1;
}
int main(int argc, char *argv[])
{
int ret;
if (argc > 1)
return 0;
ret = check_timeout_support();
if (ret) {
fprintf(stderr, "check_timeout_support failed: %d\n", ret);
return 1;
}
if (not_supported)
return 0;
ret = test_timeout_overflow();
if (ret) {
fprintf(stderr, "test_timeout_overflow failed\n");
return 1;
}
return 0;
}
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