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#include "../config-host.h"
// SPDX-License-Identifier: MIT
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <poll.h>
#include <sys/wait.h>
#include "liburing.h"
#include "helpers.h"
static int check_final_cqe(struct io_uring *ring)
{
struct io_uring_cqe *cqe;
int count = 0;
bool signalled_no_more = false;
while (!io_uring_peek_cqe(ring, &cqe)) {
if (cqe->user_data == 1) {
count++;
if (signalled_no_more) {
fprintf(stderr, "signalled no more!\n");
return T_EXIT_FAIL;
}
if (!(cqe->flags & IORING_CQE_F_MORE))
signalled_no_more = true;
} else if (cqe->user_data != 3) {
fprintf(stderr, "%d: got unexpected %d\n", count, (int)cqe->user_data);
return T_EXIT_FAIL;
}
io_uring_cqe_seen(ring, cqe);
}
if (!count) {
fprintf(stderr, "no cqe\n");
return T_EXIT_FAIL;
}
return T_EXIT_PASS;
}
static int test(bool defer_taskrun)
{
struct io_uring_cqe *cqe;
struct io_uring_sqe *sqe;
struct io_uring ring;
int pipe1[2];
int ret, i;
if (pipe(pipe1) != 0) {
perror("pipe");
return T_EXIT_FAIL;
}
struct io_uring_params params = {
/* cheat using SINGLE_ISSUER existence to know if this behaviour
* is updated
*/
.flags = IORING_SETUP_CQSIZE | IORING_SETUP_SINGLE_ISSUER,
.cq_entries = 2
};
if (defer_taskrun)
params.flags |= IORING_SETUP_SINGLE_ISSUER |
IORING_SETUP_DEFER_TASKRUN;
ret = io_uring_queue_init_params(2, &ring, ¶ms);
if (ret)
return T_EXIT_SKIP;
sqe = io_uring_get_sqe(&ring);
if (!sqe) {
fprintf(stderr, "get sqe failed\n");
return T_EXIT_FAIL;
}
io_uring_prep_poll_multishot(sqe, pipe1[0], POLLIN);
io_uring_sqe_set_data64(sqe, 1);
if (io_uring_cq_ready(&ring)) {
fprintf(stderr, "unexpected cqe\n");
return T_EXIT_FAIL;
}
for (i = 0; i < 2; i++) {
sqe = io_uring_get_sqe(&ring);
io_uring_prep_nop(sqe);
io_uring_sqe_set_data64(sqe, 2);
io_uring_submit(&ring);
}
do {
errno = 0;
ret = write(pipe1[1], "foo", 3);
} while (ret == -1 && errno == EINTR);
if (ret <= 0) {
fprintf(stderr, "write failed: %d\n", errno);
return T_EXIT_FAIL;
}
/* should have 2 cqe + 1 overflow now, so take out two cqes */
for (i = 0; i < 2; i++) {
if (io_uring_peek_cqe(&ring, &cqe)) {
fprintf(stderr, "unexpectedly no cqe\n");
return T_EXIT_FAIL;
}
if (cqe->user_data != 2) {
fprintf(stderr, "unexpected user_data\n");
return T_EXIT_FAIL;
}
io_uring_cqe_seen(&ring, cqe);
}
/* make sure everything is processed */
io_uring_get_events(&ring);
/* now remove the poll */
sqe = io_uring_get_sqe(&ring);
io_uring_prep_poll_remove(sqe, 1);
io_uring_sqe_set_data64(sqe, 3);
ret = io_uring_submit(&ring);
if (ret != 1) {
fprintf(stderr, "bad poll remove\n");
return T_EXIT_FAIL;
}
ret = check_final_cqe(&ring);
close(pipe1[0]);
close(pipe1[1]);
io_uring_queue_exit(&ring);
return ret;
}
static int test_downgrade(bool support_defer)
{
struct io_uring_cqe cqes[128];
struct io_uring_cqe *cqe;
struct io_uring_sqe *sqe;
struct io_uring ring;
int fds[2];
int ret, i, cqe_count, tmp = 0, more_cqe_count;
if (pipe(fds) != 0) {
perror("pipe");
return -1;
}
struct io_uring_params params = {
.flags = IORING_SETUP_CQSIZE,
.cq_entries = 2
};
ret = io_uring_queue_init_params(2, &ring, ¶ms);
if (ret) {
fprintf(stderr, "queue init: %d\n", ret);
return -1;
}
sqe = io_uring_get_sqe(&ring);
if (!sqe) {
fprintf(stderr, "get sqe failed\n");
return -1;
}
io_uring_prep_poll_multishot(sqe, fds[0], POLLIN);
io_uring_sqe_set_data64(sqe, 1);
io_uring_submit(&ring);
for (i = 0; i < 8; i++) {
ret = write(fds[1], &tmp, sizeof(tmp));
if (ret != sizeof(tmp)) {
perror("write");
return -1;
}
ret = read(fds[0], &tmp, sizeof(tmp));
if (ret != sizeof(tmp)) {
perror("read");
return -1;
}
}
cqe_count = 0;
while (!io_uring_peek_cqe(&ring, &cqe)) {
cqes[cqe_count++] = *cqe;
io_uring_cqe_seen(&ring, cqe);
}
/* Some kernels might allow overflows to poll,
* but if they didn't it should stop the MORE flag
*/
if (cqe_count < 3) {
fprintf(stderr, "too few cqes: %d\n", cqe_count);
return -1;
} else if (cqe_count == 8) {
more_cqe_count = cqe_count;
/* downgrade only available since support_defer */
if (support_defer) {
fprintf(stderr, "did not downgrade on overflow\n");
return -1;
}
} else {
more_cqe_count = cqe_count - 1;
cqe = &cqes[cqe_count - 1];
if (cqe->flags & IORING_CQE_F_MORE) {
fprintf(stderr, "incorrect MORE flag %x\n", cqe->flags);
return -1;
}
}
for (i = 0; i < more_cqe_count; i++) {
cqe = &cqes[i];
if (!(cqe->flags & IORING_CQE_F_MORE)) {
fprintf(stderr, "missing MORE flag\n");
return -1;
}
if (cqe->res < 0) {
fprintf(stderr, "bad res: %d\n", cqe->res);
return -1;
}
}
close(fds[0]);
close(fds[1]);
io_uring_queue_exit(&ring);
return 0;
}
int main(int argc, char *argv[])
{
int ret;
bool support_defer;
if (argc > 1)
return T_EXIT_SKIP;
support_defer = t_probe_defer_taskrun();
ret = test_downgrade(support_defer);
if (ret) {
fprintf(stderr, "%s: test_downgrade(%d) failed\n", argv[0], support_defer);
return T_EXIT_FAIL;
}
ret = test(false);
if (ret == T_EXIT_SKIP)
return ret;
if (ret != T_EXIT_PASS) {
fprintf(stderr, "%s: test(false) failed\n", argv[0]);
return ret;
}
if (support_defer) {
ret = test(true);
if (ret != T_EXIT_PASS) {
fprintf(stderr, "%s: test(true) failed\n", argv[0]);
return ret;
}
}
return ret;
}
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