1 /* SPDX-License-Identifier: MIT */
2 /*
3 * Description: test CQ ring overflow
4 *
5 */
6 #include <errno.h>
7 #include <stdio.h>
8 #include <unistd.h>
9 #include <stdlib.h>
10 #include <string.h>
11 #include <fcntl.h>
12
13 #include "liburing.h"
14 #include "helpers.h"
15
queue_n_nops(struct io_uring * ring,int n)16 static int queue_n_nops(struct io_uring *ring, int n)
17 {
18 struct io_uring_sqe *sqe;
19 int i, ret;
20
21 for (i = 0; i < n; i++) {
22 sqe = io_uring_get_sqe(ring);
23 if (!sqe) {
24 printf("get sqe failed\n");
25 goto err;
26 }
27
28 io_uring_prep_nop(sqe);
29 }
30
31 ret = io_uring_submit(ring);
32 if (ret < n) {
33 printf("Submitted only %d\n", ret);
34 goto err;
35 } else if (ret < 0) {
36 printf("sqe submit failed: %d\n", ret);
37 goto err;
38 }
39
40 return 0;
41 err:
42 return 1;
43 }
44
main(int argc,char * argv[])45 int main(int argc, char *argv[])
46 {
47 struct io_uring_cqe *cqe;
48 struct io_uring_params p;
49 struct io_uring ring;
50 int i, ret;
51
52 if (argc > 1)
53 return T_EXIT_SKIP;
54
55 memset(&p, 0, sizeof(p));
56 ret = io_uring_queue_init_params(4, &ring, &p);
57 if (ret) {
58 printf("ring setup failed\n");
59 return T_EXIT_FAIL;
60
61 }
62
63 if (queue_n_nops(&ring, 4))
64 goto err;
65 if (queue_n_nops(&ring, 4))
66 goto err;
67 if (queue_n_nops(&ring, 4))
68 goto err;
69
70 i = 0;
71 do {
72 ret = io_uring_peek_cqe(&ring, &cqe);
73 if (ret < 0) {
74 if (ret == -EAGAIN)
75 break;
76 printf("wait completion %d\n", ret);
77 goto err;
78 }
79 io_uring_cqe_seen(&ring, cqe);
80 if (!cqe)
81 break;
82 i++;
83 } while (1);
84
85 if (i < 8 ||
86 ((*ring.cq.koverflow != 4) && !(p.features & IORING_FEAT_NODROP))) {
87 printf("CQ overflow fail: %d completions, %u overflow\n", i,
88 *ring.cq.koverflow);
89 goto err;
90 }
91
92 io_uring_queue_exit(&ring);
93 return T_EXIT_PASS;
94 err:
95 io_uring_queue_exit(&ring);
96 return T_EXIT_FAIL;
97 }
98