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-rw-r--r--tools/virtio/virtio_test.c263
1 files changed, 263 insertions, 0 deletions
diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
new file mode 100644
index 000000000000..74d3331bdaf9
--- /dev/null
+++ b/tools/virtio/virtio_test.c
@@ -0,0 +1,263 @@
1#define _GNU_SOURCE
2#include <getopt.h>
3#include <string.h>
4#include <poll.h>
5#include <sys/eventfd.h>
6#include <stdlib.h>
7#include <assert.h>
8#include <unistd.h>
9#include <sys/ioctl.h>
10#include <sys/stat.h>
11#include <sys/types.h>
12#include <fcntl.h>
13#include <linux/vhost.h>
14#include <linux/virtio.h>
15#include <linux/virtio_ring.h>
16#include "../../drivers/vhost/test.h"
17
18struct vq_info {
19 int kick;
20 int call;
21 int num;
22 int idx;
23 void *ring;
24 /* copy used for control */
25 struct vring vring;
26 struct virtqueue *vq;
27};
28
29struct vdev_info {
30 struct virtio_device vdev;
31 int control;
32 struct pollfd fds[1];
33 struct vq_info vqs[1];
34 int nvqs;
35 void *buf;
36 size_t buf_size;
37 struct vhost_memory *mem;
38};
39
40void vq_notify(struct virtqueue *vq)
41{
42 struct vq_info *info = vq->priv;
43 unsigned long long v = 1;
44 int r;
45 r = write(info->kick, &v, sizeof v);
46 assert(r == sizeof v);
47}
48
49void vq_callback(struct virtqueue *vq)
50{
51}
52
53
54void vhost_vq_setup(struct vdev_info *dev, struct vq_info *info)
55{
56 struct vhost_vring_state state = { .index = info->idx };
57 struct vhost_vring_file file = { .index = info->idx };
58 unsigned long long features = dev->vdev.features[0];
59 struct vhost_vring_addr addr = {
60 .index = info->idx,
61 .desc_user_addr = (uint64_t)(unsigned long)info->vring.desc,
62 .avail_user_addr = (uint64_t)(unsigned long)info->vring.avail,
63 .used_user_addr = (uint64_t)(unsigned long)info->vring.used,
64 };
65 int r;
66 r = ioctl(dev->control, VHOST_SET_FEATURES, &features);
67 assert(r >= 0);
68 state.num = info->vring.num;
69 r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state);
70 assert(r >= 0);
71 state.num = 0;
72 r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state);
73 assert(r >= 0);
74 r = ioctl(dev->control, VHOST_SET_VRING_ADDR, &addr);
75 assert(r >= 0);
76 file.fd = info->kick;
77 r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file);
78 assert(r >= 0);
79 file.fd = info->call;
80 r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file);
81 assert(r >= 0);
82}
83
84static void vq_info_add(struct vdev_info *dev, int num)
85{
86 struct vq_info *info = &dev->vqs[dev->nvqs];
87 int r;
88 info->idx = dev->nvqs;
89 info->kick = eventfd(0, EFD_NONBLOCK);
90 info->call = eventfd(0, EFD_NONBLOCK);
91 r = posix_memalign(&info->ring, 4096, vring_size(num, 4096));
92 assert(r >= 0);
93 memset(info->ring, 0, vring_size(num, 4096));
94 vring_init(&info->vring, num, info->ring, 4096);
95 info->vq = vring_new_virtqueue(info->vring.num, 4096, &dev->vdev, info->ring,
96 vq_notify, vq_callback, "test");
97 assert(info->vq);
98 info->vq->priv = info;
99 vhost_vq_setup(dev, info);
100 dev->fds[info->idx].fd = info->call;
101 dev->fds[info->idx].events = POLLIN;
102 dev->nvqs++;
103}
104
105static void vdev_info_init(struct vdev_info* dev, unsigned long long features)
106{
107 int r;
108 memset(dev, 0, sizeof *dev);
109 dev->vdev.features[0] = features;
110 dev->vdev.features[1] = features >> 32;
111 dev->buf_size = 1024;
112 dev->buf = malloc(dev->buf_size);
113 assert(dev->buf);
114 dev->control = open("/dev/vhost-test", O_RDWR);
115 assert(dev->control >= 0);
116 r = ioctl(dev->control, VHOST_SET_OWNER, NULL);
117 assert(r >= 0);
118 dev->mem = malloc(offsetof(struct vhost_memory, regions) +
119 sizeof dev->mem->regions[0]);
120 assert(dev->mem);
121 memset(dev->mem, 0, offsetof(struct vhost_memory, regions) +
122 sizeof dev->mem->regions[0]);
123 dev->mem->nregions = 1;
124 dev->mem->regions[0].guest_phys_addr = (long)dev->buf;
125 dev->mem->regions[0].userspace_addr = (long)dev->buf;
126 dev->mem->regions[0].memory_size = dev->buf_size;
127 r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem);
128 assert(r >= 0);
129}
130
131/* TODO: this is pretty bad: we get a cache line bounce
132 * for the wait queue on poll and another one on read,
133 * plus the read which is there just to clear the
134 * current state. */
135static void wait_for_interrupt(struct vdev_info *dev)
136{
137 int i;
138 unsigned long long val;
139 poll(dev->fds, dev->nvqs, -1);
140 for (i = 0; i < dev->nvqs; ++i)
141 if (dev->fds[i].revents & POLLIN) {
142 read(dev->fds[i].fd, &val, sizeof val);
143 }
144}
145
146static void run_test(struct vdev_info *dev, struct vq_info *vq, int bufs)
147{
148 struct scatterlist sl;
149 long started = 0, completed = 0;
150 long completed_before;
151 int r, test = 1;
152 unsigned len;
153 long long spurious = 0;
154 r = ioctl(dev->control, VHOST_TEST_RUN, &test);
155 assert(r >= 0);
156 for (;;) {
157 virtqueue_disable_cb(vq->vq);
158 completed_before = completed;
159 do {
160 if (started < bufs) {
161 sg_init_one(&sl, dev->buf, dev->buf_size);
162 r = virtqueue_add_buf(vq->vq, &sl, 1, 0,
163 dev->buf + started);
164 if (likely(r >= 0)) {
165 ++started;
166 virtqueue_kick(vq->vq);
167 }
168 } else
169 r = -1;
170
171 /* Flush out completed bufs if any */
172 if (virtqueue_get_buf(vq->vq, &len)) {
173 ++completed;
174 r = 0;
175 }
176
177 } while (r >= 0);
178 if (completed == completed_before)
179 ++spurious;
180 assert(completed <= bufs);
181 assert(started <= bufs);
182 if (completed == bufs)
183 break;
184 if (virtqueue_enable_cb(vq->vq)) {
185 wait_for_interrupt(dev);
186 }
187 }
188 test = 0;
189 r = ioctl(dev->control, VHOST_TEST_RUN, &test);
190 assert(r >= 0);
191 fprintf(stderr, "spurious wakeus: 0x%llx\n", spurious);
192}
193
194const char optstring[] = "h";
195const struct option longopts[] = {
196 {
197 .name = "help",
198 .val = 'h',
199 },
200 {
201 .name = "event-idx",
202 .val = 'E',
203 },
204 {
205 .name = "no-event-idx",
206 .val = 'e',
207 },
208 {
209 .name = "indirect",
210 .val = 'I',
211 },
212 {
213 .name = "no-indirect",
214 .val = 'i',
215 },
216 {
217 }
218};
219
220static void help()
221{
222 fprintf(stderr, "Usage: virtio_test [--help]"
223 " [--no-indirect]"
224 " [--no-event-idx]"
225 "\n");
226}
227
228int main(int argc, char **argv)
229{
230 struct vdev_info dev;
231 unsigned long long features = (1ULL << VIRTIO_RING_F_INDIRECT_DESC) |
232 (1ULL << VIRTIO_RING_F_EVENT_IDX);
233 int o;
234
235 for (;;) {
236 o = getopt_long(argc, argv, optstring, longopts, NULL);
237 switch (o) {
238 case -1:
239 goto done;
240 case '?':
241 help();
242 exit(2);
243 case 'e':
244 features &= ~(1ULL << VIRTIO_RING_F_EVENT_IDX);
245 break;
246 case 'h':
247 help();
248 goto done;
249 case 'i':
250 features &= ~(1ULL << VIRTIO_RING_F_INDIRECT_DESC);
251 break;
252 default:
253 assert(0);
254 break;
255 }
256 }
257
258done:
259 vdev_info_init(&dev, features);
260 vq_info_add(&dev, 256);
261 run_test(&dev, &dev.vqs[0], 0x100000);
262 return 0;
263}
generated by cgit v1.2.2 (git 2.25.0) at 2025-07-12 21:15:01 -0400