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#include "../config-host.h"
/* SPDX-License-Identifier: MIT */
/*
* Description: test min timeout handling
*
*/
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <pthread.h>
#include "liburing.h"
#include "helpers.h"
#define NPIPES 8
#define NWRITES 6
#define WAIT_USEC (250000)
static int no_min_timeout;
struct d {
int fd[NPIPES];
long delay;
};
static void *thread_fn(void *data)
{
struct d *d = data;
char buf[32];
int i;
memset(buf, 0x55, sizeof(buf));
for (i = 0; i < NWRITES; i++) {
int ret;
usleep(d->delay);
ret = write(d->fd[i], buf, sizeof(buf));
if (ret != sizeof(buf)) {
fprintf(stderr, "bad write %d\n", ret);
break;
}
}
return NULL;
}
/*
* Allow 25% tolerance
*/
static int within_range(unsigned int target, unsigned int msec)
{
unsigned int high, low;
low = (target * 3) / 4;
high = (target * 5) / 4;
return (msec >= low && msec <= high);
}
static int test(int flags, int expected_ctx, int min_wait, int write_delay,
int nr_cqes, int msec_target)
{
struct io_uring_cqe *cqe;
struct io_uring_sqe *sqe;
struct io_uring ring;
struct __kernel_timespec ts;
struct rusage s, e;
pthread_t thread;
struct d d;
struct io_uring_params p = { .flags = flags, };
int ret, fds[NPIPES][2], i;
struct timeval start_time;
char buf[32];
void *tret;
long ttime;
ret = io_uring_queue_init_params(NPIPES, &ring, &p);
if (ret == -EINVAL)
return T_EXIT_SKIP;
if (!(p.features & IORING_FEAT_MIN_TIMEOUT)) {
no_min_timeout = 1;
return T_EXIT_SKIP;
}
for (i = 0; i < NPIPES; i++) {
if (pipe(fds[i]) < 0) {
perror("pipe");
return 1;
}
d.fd[i] = fds[i][1];
}
d.delay = write_delay;
pthread_create(&thread, NULL, thread_fn, &d);
for (i = 0; i < NPIPES; i++) {
sqe = io_uring_get_sqe(&ring);
io_uring_prep_read(sqe, fds[i][0], buf, sizeof(buf), 0);
}
ts.tv_sec = 0;
ts.tv_nsec = WAIT_USEC * 1000LL;
gettimeofday(&start_time, NULL);
getrusage(RUSAGE_THREAD, &s);
ret = io_uring_submit_and_wait_min_timeout(&ring, &cqe, 8, &ts, min_wait, NULL);
if (ret != NPIPES)
fprintf(stderr, "submit_and_wait=%d\n", ret);
getrusage(RUSAGE_THREAD, &e);
e.ru_nvcsw -= s.ru_nvcsw;
ttime = mtime_since_now(&start_time);
if (!within_range(msec_target, ttime)) {
fprintf(stderr, "Expected %d msec, got %ld msec\n", msec_target,
ttime);
fprintf(stderr, "flags=%x, min_wait=%d, write_delay=%d\n",
flags, min_wait, write_delay);
}
/* will usually be accurate, but allow for offset of 1 */
if (e.ru_nvcsw != expected_ctx &&
(e.ru_nvcsw - expected_ctx > 1))
fprintf(stderr, "%ld ctx switches, expected %d\n", e.ru_nvcsw,
expected_ctx);
for (i = 0; i < NPIPES; i++) {
ret = io_uring_peek_cqe(&ring, &cqe);
if (ret)
break;
io_uring_cqe_seen(&ring, cqe);
}
if (i != nr_cqes)
fprintf(stderr, "Got %d CQEs, expected %d\n", i, nr_cqes);
pthread_join(thread, &tret);
for (i = 0; i < NPIPES; i++) {
close(fds[i][0]);
close(fds[i][1]);
}
return T_EXIT_PASS;
}
int main(int argc, char *argv[])
{
int ret;
if (argc > 1)
return T_EXIT_SKIP;
ret = test(0, NWRITES + 1, 0, 2000, NWRITES, WAIT_USEC / 1000);
if (ret == T_EXIT_FAIL)
return T_EXIT_FAIL;
if (no_min_timeout)
return T_EXIT_SKIP;
ret = test(0, NWRITES + 1, 50000, 2000, NWRITES, 50);
if (ret == T_EXIT_FAIL)
return T_EXIT_FAIL;
ret = test(0, NWRITES + 1, 500000, 2000, NWRITES, 500);
if (ret == T_EXIT_FAIL)
return T_EXIT_FAIL;
/* no writes within min timeout, but it's given. expect 1 cqe */
ret = test(0, 1, 10000, 20000, 1, 20);
if (ret == T_EXIT_FAIL)
return T_EXIT_FAIL;
/* same as above, but no min timeout. should time out and we get 6 */
ret = test(0, NWRITES + 1, 0, 20000, NWRITES, WAIT_USEC / 1000);
if (ret == T_EXIT_FAIL)
return T_EXIT_FAIL;
ret = test(IORING_SETUP_SINGLE_ISSUER | IORING_SETUP_DEFER_TASKRUN, 1,
0, 2000, NWRITES, WAIT_USEC / 1000);
if (ret == T_EXIT_FAIL)
return T_EXIT_FAIL;
ret = test(IORING_SETUP_SINGLE_ISSUER | IORING_SETUP_DEFER_TASKRUN, 1,
50000, 2000, NWRITES, 50);
if (ret == T_EXIT_FAIL)
return T_EXIT_FAIL;
ret = test(IORING_SETUP_SINGLE_ISSUER | IORING_SETUP_DEFER_TASKRUN, 1,
500000, 2000, NWRITES, 500);
if (ret == T_EXIT_FAIL)
return T_EXIT_FAIL;
/* no writes within min timeout, but it's given. expect 1 cqe */
ret = test(IORING_SETUP_SINGLE_ISSUER | IORING_SETUP_DEFER_TASKRUN, 1,
10000, 20000, 1, 20);
if (ret == T_EXIT_FAIL)
return T_EXIT_FAIL;
/* same as above, but no min timeout. should time out and we get 6 */
ret = test(IORING_SETUP_SINGLE_ISSUER | IORING_SETUP_DEFER_TASKRUN, 1,
0, 20000, NWRITES, WAIT_USEC / 1000);
if (ret == T_EXIT_FAIL)
return T_EXIT_FAIL;
return ret;
}
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