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, 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 } 104 105 static 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. */ 135 static 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 } 145 146 static 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 } 193 194 const char optstring[] = "h"; 195 const struct option longopts[] = { 196 { 197 .name = "help", 198 .val = 'h', 199 }, 200 { 201 .name = "indirect", 202 .val = 'I', 203 }, 204 { 205 .name = "no-indirect", 206 .val = 'i', 207 }, 208 { 209 } 210 }; 211 212 static void help() 213 { 214 fprintf(stderr, "Usage: virtio_test [--help] [--no-indirect]\n"); 215 } 216 217 int main(int argc, char **argv) 218 { 219 struct vdev_info dev; 220 unsigned long long features = 1ULL << VIRTIO_RING_F_INDIRECT_DESC; 221 int o; 222 223 for (;;) { 224 o = getopt_long(argc, argv, optstring, longopts, NULL); 225 switch (o) { 226 case -1: 227 goto done; 228 case '?': 229 help(); 230 exit(2); 231 case 'h': 232 help(); 233 goto done; 234 case 'i': 235 features &= ~(1ULL << VIRTIO_RING_F_INDIRECT_DESC); 236 break; 237 default: 238 assert(0); 239 break; 240 } 241 } 242 243 done: 244 vdev_info_init(&dev, features); 245 vq_info_add(&dev, 256); 246 run_test(&dev, &dev.vqs[0], 0x100000); 247 return 0; 248 } 249