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Linux/tools/virtio/virtio_test.c

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  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 
 18 struct 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 
 29 struct 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 
 40 void 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 
 49 void vq_callback(struct virtqueue *vq)
 50 {
 51 }
 52 
 53 
 54 void 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 
 84 static 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,
 96                                        true, info->ring,
 97                                        vq_notify, vq_callback, "test");
 98         assert(info->vq);
 99         info->vq->priv = info;
100         vhost_vq_setup(dev, info);
101         dev->fds[info->idx].fd = info->call;
102         dev->fds[info->idx].events = POLLIN;
103         dev->nvqs++;
104 }
105 
106 static void vdev_info_init(struct vdev_info* dev, unsigned long long features)
107 {
108         int r;
109         memset(dev, 0, sizeof *dev);
110         dev->vdev.features[0] = features;
111         dev->vdev.features[1] = features >> 32;
112         dev->buf_size = 1024;
113         dev->buf = malloc(dev->buf_size);
114         assert(dev->buf);
115         dev->control = open("/dev/vhost-test", O_RDWR);
116         assert(dev->control >= 0);
117         r = ioctl(dev->control, VHOST_SET_OWNER, NULL);
118         assert(r >= 0);
119         dev->mem = malloc(offsetof(struct vhost_memory, regions) +
120                           sizeof dev->mem->regions[0]);
121         assert(dev->mem);
122         memset(dev->mem, 0, offsetof(struct vhost_memory, regions) +
123                           sizeof dev->mem->regions[0]);
124         dev->mem->nregions = 1;
125         dev->mem->regions[0].guest_phys_addr = (long)dev->buf;
126         dev->mem->regions[0].userspace_addr = (long)dev->buf;
127         dev->mem->regions[0].memory_size = dev->buf_size;
128         r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem);
129         assert(r >= 0);
130 }
131 
132 /* TODO: this is pretty bad: we get a cache line bounce
133  * for the wait queue on poll and another one on read,
134  * plus the read which is there just to clear the
135  * current state. */
136 static void wait_for_interrupt(struct vdev_info *dev)
137 {
138         int i;
139         unsigned long long val;
140         poll(dev->fds, dev->nvqs, -1);
141         for (i = 0; i < dev->nvqs; ++i)
142                 if (dev->fds[i].revents & POLLIN) {
143                         read(dev->fds[i].fd, &val, sizeof val);
144                 }
145 }
146 
147 static void run_test(struct vdev_info *dev, struct vq_info *vq, int bufs)
148 {
149         struct scatterlist sl;
150         long started = 0, completed = 0;
151         long completed_before;
152         int r, test = 1;
153         unsigned len;
154         long long spurious = 0;
155         r = ioctl(dev->control, VHOST_TEST_RUN, &test);
156         assert(r >= 0);
157         for (;;) {
158                 virtqueue_disable_cb(vq->vq);
159                 completed_before = completed;
160                 do {
161                         if (started < bufs) {
162                                 sg_init_one(&sl, dev->buf, dev->buf_size);
163                                 r = virtqueue_add_buf(vq->vq, &sl, 1, 0,
164                                                       dev->buf + started,
165                                                       GFP_ATOMIC);
166                                 if (likely(r >= 0)) {
167                                         ++started;
168                                         virtqueue_kick(vq->vq);
169                                 }
170                         } else
171                                 r = -1;
172 
173                         /* Flush out completed bufs if any */
174                         if (virtqueue_get_buf(vq->vq, &len)) {
175                                 ++completed;
176                                 r = 0;
177                         }
178 
179                 } while (r >= 0);
180                 if (completed == completed_before)
181                         ++spurious;
182                 assert(completed <= bufs);
183                 assert(started <= bufs);
184                 if (completed == bufs)
185                         break;
186                 if (virtqueue_enable_cb(vq->vq)) {
187                         wait_for_interrupt(dev);
188                 }
189         }
190         test = 0;
191         r = ioctl(dev->control, VHOST_TEST_RUN, &test);
192         assert(r >= 0);
193         fprintf(stderr, "spurious wakeus: 0x%llx\n", spurious);
194 }
195 
196 const char optstring[] = "h";
197 const struct option longopts[] = {
198         {
199                 .name = "help",
200                 .val = 'h',
201         },
202         {
203                 .name = "event-idx",
204                 .val = 'E',
205         },
206         {
207                 .name = "no-event-idx",
208                 .val = 'e',
209         },
210         {
211                 .name = "indirect",
212                 .val = 'I',
213         },
214         {
215                 .name = "no-indirect",
216                 .val = 'i',
217         },
218         {
219         }
220 };
221 
222 static void help()
223 {
224         fprintf(stderr, "Usage: virtio_test [--help]"
225                 " [--no-indirect]"
226                 " [--no-event-idx]"
227                 "\n");
228 }
229 
230 int main(int argc, char **argv)
231 {
232         struct vdev_info dev;
233         unsigned long long features = (1ULL << VIRTIO_RING_F_INDIRECT_DESC) |
234                 (1ULL << VIRTIO_RING_F_EVENT_IDX);
235         int o;
236 
237         for (;;) {
238                 o = getopt_long(argc, argv, optstring, longopts, NULL);
239                 switch (o) {
240                 case -1:
241                         goto done;
242                 case '?':
243                         help();
244                         exit(2);
245                 case 'e':
246                         features &= ~(1ULL << VIRTIO_RING_F_EVENT_IDX);
247                         break;
248                 case 'h':
249                         help();
250                         goto done;
251                 case 'i':
252                         features &= ~(1ULL << VIRTIO_RING_F_INDIRECT_DESC);
253                         break;
254                 default:
255                         assert(0);
256                         break;
257                 }
258         }
259 
260 done:
261         vdev_info_init(&dev, features);
262         vq_info_add(&dev, 256);
263         run_test(&dev, &dev.vqs[0], 0x100000);
264         return 0;
265 }
266 

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