1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
/*
* Description: run various CQ ring overflow tests
*
*/
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include "liburing.h"
static int reap_events(struct io_uring *ring, unsigned nr_events, int do_wait)
{
struct io_uring_cqe *cqe;
int i, ret = 0, seq = 0;
for (i = 0; i < nr_events; i++) {
if (do_wait)
ret = io_uring_wait_cqe(ring, &cqe);
else
ret = io_uring_peek_cqe(ring, &cqe);
if (ret) {
if (ret != -EAGAIN)
fprintf(stderr, "cqe peek failed: %d\n", ret);
break;
}
if (cqe->user_data != seq) {
fprintf(stderr, "cqe sequence out-of-order\n");
fprintf(stderr, "got %d, wanted %d\n", (int) cqe->user_data,
seq);
return -EINVAL;
}
seq++;
io_uring_cqe_seen(ring, cqe);
}
return i ? i : ret;
}
/*
* Setup ring with CQ_NODROP and check we get -EBUSY on trying to submit new IO
* on an overflown ring, and that we get all the events (even overflows) when
* we finally reap them.
*/
static int test_overflow_nodrop(void)
{
struct __kernel_timespec ts;
struct io_uring_sqe *sqe;
struct io_uring ring;
unsigned pending;
int ret, i, j;
ret = io_uring_queue_init(4, &ring, IORING_SETUP_CQ_NODROP);
if (ret) {
if (ret == -EINVAL) {
fprintf(stdout, "CQ_NODROP not supported, skipped\n");
return 0;
}
fprintf(stderr, "io_uring_queue_init failed %d\n", ret);
return 1;
}
ts.tv_sec = 0;
ts.tv_nsec = 10000000;
/* submit 4x4 SQEs, should overflow the ring by 8 */
pending = 0;
for (i = 0; i < 4; i++) {
for (j = 0; j < 4; j++) {
sqe = io_uring_get_sqe(&ring);
if (!sqe) {
fprintf(stderr, "get sqe failed\n");
goto err;
}
io_uring_prep_timeout(sqe, &ts, -1U, 0);
sqe->user_data = (i * 4) + j;
}
ret = io_uring_submit(&ring);
if (ret != 4) {
fprintf(stderr, "sqe submit failed: %d, %d\n", ret, pending);
goto err;
}
}
/* wait for timers to fire */
usleep(2 * 10000);
/*
* We should have 16 pending CQEs now, 8 of them in the overflow list. Any
* attempt to queue more IO should return -EBUSY
*/
sqe = io_uring_get_sqe(&ring);
if (!sqe) {
fprintf(stderr, "get sqe failed\n");
goto err;
}
io_uring_prep_nop(sqe);
ret = io_uring_submit(&ring);
if (ret != -EBUSY) {
fprintf(stderr, "expected sqe submit busy: %d\n", ret);
goto err;
}
/* reap the 16 events we should have available */
ret = reap_events(&ring, 16, 1);
if (ret < 0) {
fprintf(stderr, "ret=%d\n", ret);
goto err;
}
if (*ring.cq.koverflow) {
fprintf(stderr, "cq ring overflow %d, expected 0\n",
*ring.cq.koverflow);
goto err;
}
io_uring_queue_exit(&ring);
return 0;
err:
io_uring_queue_exit(&ring);
return 1;
}
/*
* Submit some NOPs and watch if the overflow is correct
*/
static int test_overflow(void)
{
struct io_uring ring;
struct io_uring_sqe *sqe;
int ret, i, j;
ret = io_uring_queue_init(4, &ring, 0);
if (ret) {
fprintf(stderr, "io_uring_queue_init failed %d\n", ret);
return 1;
}
/* submit 4x4 SQEs, should overflow the ring by 8 */
for (i = 0; i < 4; i++) {
for (j = 0; j < 4; j++) {
sqe = io_uring_get_sqe(&ring);
if (!sqe) {
fprintf(stderr, "get sqe failed\n");
goto err;
}
io_uring_prep_nop(sqe);
sqe->user_data = (i * 4) + j;
}
ret = io_uring_submit(&ring);
if (ret != 4) {
fprintf(stderr, "sqe submit failed: %d\n", ret);
goto err;
}
}
/* we should now have 8 completions ready */
ret = reap_events(&ring, 8, 0);
if (ret < 0)
goto err;
if (*ring.cq.koverflow != 8) {
fprintf(stderr, "cq ring overflow %d, expected 8\n",
*ring.cq.koverflow);
goto err;
}
io_uring_queue_exit(&ring);
return 0;
err:
io_uring_queue_exit(&ring);
return 1;
}
int main(int argc, char *argv[])
{
int ret;
ret = test_overflow();
if (ret) {
printf("test_overflow failed\n");
return ret;
}
ret = test_overflow_nodrop();
if (ret) {
printf("test_overflow_nodrop failed\n");
return ret;
}
return 0;
}
|
