tools/virtio/virtio_test.c

   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,
 148                      bool delayed, int bufs)
 149 {
 150         struct scatterlist sl;
 151         long started = 0, completed = 0;
 152         long completed_before;
 153         int r, test = 1;
 154         unsigned len;
 155         long long spurious = 0;
 156         r = ioctl(dev->control, VHOST_TEST_RUN, &test);
 157         assert(r >= 0);
 158         for (;;) {
 159                 virtqueue_disable_cb(vq->vq);
 160                 completed_before = completed;
 161                 do {
 162                         if (started < bufs) {
 163                                 sg_init_one(&sl, dev->buf, dev->buf_size);
 164                                 r = virtqueue_add_buf(vq->vq, &sl, 1, 0,
 165                                                       dev->buf + started,
 166                                                       GFP_ATOMIC);
 167                                 if (likely(r >= 0)) {
 168                                         ++started;
 169                                         virtqueue_kick(vq->vq);
 170                                 }
 171                         } else
 172                                 r = -1;
 173
 174                         /* Flush out completed bufs if any */
 175                         if (virtqueue_get_buf(vq->vq, &len)) {
 176                                 ++completed;
 177                                 r = 0;
 178                         }
 179
 180                 } while (r >= 0);
 181                 if (completed == completed_before)
 182                         ++spurious;
 183                 assert(completed <= bufs);
 184                 assert(started <= bufs);
 185                 if (completed == bufs)
 186                         break;
 187                 if (delayed) {
 188                         if (virtqueue_enable_cb_delayed(vq->vq))
 189                                 wait_for_interrupt(dev);
 190                 } else {
 191                         if (virtqueue_enable_cb(vq->vq))
 192                                 wait_for_interrupt(dev);
 193                 }
 194         }
 195         test = 0;
 196         r = ioctl(dev->control, VHOST_TEST_RUN, &test);
 197         assert(r >= 0);
 198         fprintf(stderr, "spurious wakeus: 0x%llx\n", spurious);
 199 }
 200
 201 const char optstring[] = "h";
 202 const struct option longopts[] = {
 203         {
 204                 .name = "help",
 205                 .val = 'h',
 206         },
 207         {
 208                 .name = "event-idx",
 209                 .val = 'E',
 210         },
 211         {
 212                 .name = "no-event-idx",
 213                 .val = 'e',
 214         },
 215         {
 216                 .name = "indirect",
 217                 .val = 'I',
 218         },
 219         {
 220                 .name = "no-indirect",
 221                 .val = 'i',
 222         },
 223         {
 224                 .name = "delayed-interrupt",
 225                 .val = 'D',
 226         },
 227         {
 228                 .name = "no-delayed-interrupt",
 229                 .val = 'd',
 230         },
 231         {
 232         }
 233 };
 234
 235 static void help()
 236 {
 237         fprintf(stderr, "Usage: virtio_test [--help]"
 238                 " [--no-indirect]"
 239                 " [--no-event-idx]"
 240                 " [--delayed-interrupt]"
 241                 "\n");
 242 }
 243
 244 int main(int argc, char **argv)
 245 {
 246         struct vdev_info dev;
 247         unsigned long long features = (1ULL << VIRTIO_RING_F_INDIRECT_DESC) |
 248                 (1ULL << VIRTIO_RING_F_EVENT_IDX);
 249         int o;
 250         bool delayed = false;
 251
 252         for (;;) {
 253                 o = getopt_long(argc, argv, optstring, longopts, NULL);
 254                 switch (o) {
 255                 case -1:
 256                         goto done;
 257                 case '?':
 258                         help();
 259                         exit(2);
 260                 case 'e':
 261                         features &= ~(1ULL << VIRTIO_RING_F_EVENT_IDX);
 262                         break;
 263                 case 'h':
 264                         help();
 265                         goto done;
 266                 case 'i':
 267                         features &= ~(1ULL << VIRTIO_RING_F_INDIRECT_DESC);
 268                         break;
 269                 case 'D':
 270                         delayed = true;
 271                         break;
 272                 default:
 273                         assert(0);
 274                         break;
 275                 }
 276         }
 277
 278 done:
 279         vdev_info_init(&dev, features);
 280         vq_info_add(&dev, 256);
 281         run_test(&dev, &dev.vqs[0], delayed, 0x100000);
 282         return 0;
 283 }