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tools/virtio: virtio_test tool
This is the userspace part of the tool: it includes a bunch of stubs for linux APIs, somewhat simular to linuxsched. This makes it possible to recompile the ring code in userspace. A small test example is implemented combining this with vhost_test module. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin
parent
71ccc212e5
commit
4e53f78e5b
5 changed files with 487 additions and 0 deletions
248
tools/virtio/virtio_test.c
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248
tools/virtio/virtio_test.c
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#define _GNU_SOURCE
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#include <getopt.h>
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#include <string.h>
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#include <poll.h>
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#include <sys/eventfd.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <linux/vhost.h>
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#include <linux/virtio.h>
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#include <linux/virtio_ring.h>
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#include "../../drivers/vhost/test.h"
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struct vq_info {
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int kick;
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int call;
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int num;
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int idx;
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void *ring;
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/* copy used for control */
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struct vring vring;
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struct virtqueue *vq;
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};
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struct vdev_info {
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struct virtio_device vdev;
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int control;
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struct pollfd fds[1];
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struct vq_info vqs[1];
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int nvqs;
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void *buf;
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size_t buf_size;
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struct vhost_memory *mem;
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};
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void vq_notify(struct virtqueue *vq)
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{
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struct vq_info *info = vq->priv;
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unsigned long long v = 1;
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int r;
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r = write(info->kick, &v, sizeof v);
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assert(r == sizeof v);
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}
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void vq_callback(struct virtqueue *vq)
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{
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}
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void vhost_vq_setup(struct vdev_info *dev, struct vq_info *info)
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{
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struct vhost_vring_state state = { .index = info->idx };
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struct vhost_vring_file file = { .index = info->idx };
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unsigned long long features = dev->vdev.features[0];
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struct vhost_vring_addr addr = {
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.index = info->idx,
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.desc_user_addr = (uint64_t)(unsigned long)info->vring.desc,
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.avail_user_addr = (uint64_t)(unsigned long)info->vring.avail,
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.used_user_addr = (uint64_t)(unsigned long)info->vring.used,
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};
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int r;
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r = ioctl(dev->control, VHOST_SET_FEATURES, &features);
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assert(r >= 0);
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state.num = info->vring.num;
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r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state);
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assert(r >= 0);
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state.num = 0;
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r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state);
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assert(r >= 0);
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r = ioctl(dev->control, VHOST_SET_VRING_ADDR, &addr);
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assert(r >= 0);
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file.fd = info->kick;
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r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file);
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assert(r >= 0);
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file.fd = info->call;
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r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file);
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assert(r >= 0);
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}
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static void vq_info_add(struct vdev_info *dev, int num)
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{
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struct vq_info *info = &dev->vqs[dev->nvqs];
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int r;
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info->idx = dev->nvqs;
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info->kick = eventfd(0, EFD_NONBLOCK);
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info->call = eventfd(0, EFD_NONBLOCK);
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r = posix_memalign(&info->ring, 4096, vring_size(num, 4096));
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assert(r >= 0);
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memset(info->ring, 0, vring_size(num, 4096));
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vring_init(&info->vring, num, info->ring, 4096);
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info->vq = vring_new_virtqueue(info->vring.num, 4096, &dev->vdev, info->ring,
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vq_notify, vq_callback, "test");
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assert(info->vq);
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info->vq->priv = info;
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vhost_vq_setup(dev, info);
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dev->fds[info->idx].fd = info->call;
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dev->fds[info->idx].events = POLLIN;
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dev->nvqs++;
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}
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static void vdev_info_init(struct vdev_info* dev, unsigned long long features)
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{
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int r;
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memset(dev, 0, sizeof *dev);
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dev->vdev.features[0] = features;
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dev->vdev.features[1] = features >> 32;
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dev->buf_size = 1024;
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dev->buf = malloc(dev->buf_size);
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assert(dev->buf);
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dev->control = open("/dev/vhost-test", O_RDWR);
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assert(dev->control >= 0);
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r = ioctl(dev->control, VHOST_SET_OWNER, NULL);
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assert(r >= 0);
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dev->mem = malloc(offsetof(struct vhost_memory, regions) +
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sizeof dev->mem->regions[0]);
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assert(dev->mem);
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memset(dev->mem, 0, offsetof(struct vhost_memory, regions) +
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sizeof dev->mem->regions[0]);
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dev->mem->nregions = 1;
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dev->mem->regions[0].guest_phys_addr = (long)dev->buf;
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dev->mem->regions[0].userspace_addr = (long)dev->buf;
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dev->mem->regions[0].memory_size = dev->buf_size;
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r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem);
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assert(r >= 0);
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}
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/* TODO: this is pretty bad: we get a cache line bounce
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* for the wait queue on poll and another one on read,
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* plus the read which is there just to clear the
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* current state. */
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static void wait_for_interrupt(struct vdev_info *dev)
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{
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int i;
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unsigned long long val;
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poll(dev->fds, dev->nvqs, -1);
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for (i = 0; i < dev->nvqs; ++i)
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if (dev->fds[i].revents & POLLIN) {
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read(dev->fds[i].fd, &val, sizeof val);
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}
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}
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static void run_test(struct vdev_info *dev, struct vq_info *vq, int bufs)
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{
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struct scatterlist sl;
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long started = 0, completed = 0;
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long completed_before;
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int r, test = 1;
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unsigned len;
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long long spurious = 0;
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r = ioctl(dev->control, VHOST_TEST_RUN, &test);
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assert(r >= 0);
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for (;;) {
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virtqueue_disable_cb(vq->vq);
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completed_before = completed;
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do {
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if (started < bufs) {
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sg_init_one(&sl, dev->buf, dev->buf_size);
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r = virtqueue_add_buf(vq->vq, &sl, 1, 0,
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dev->buf + started);
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if (likely(r >= 0)) {
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++started;
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virtqueue_kick(vq->vq);
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}
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} else
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r = -1;
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/* Flush out completed bufs if any */
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if (virtqueue_get_buf(vq->vq, &len)) {
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++completed;
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r = 0;
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}
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} while (r >= 0);
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if (completed == completed_before)
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++spurious;
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assert(completed <= bufs);
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assert(started <= bufs);
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if (completed == bufs)
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break;
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if (virtqueue_enable_cb(vq->vq)) {
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wait_for_interrupt(dev);
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}
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}
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test = 0;
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r = ioctl(dev->control, VHOST_TEST_RUN, &test);
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assert(r >= 0);
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fprintf(stderr, "spurious wakeus: 0x%llx\n", spurious);
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}
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const char optstring[] = "h";
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const struct option longopts[] = {
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{
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.name = "help",
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.val = 'h',
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},
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{
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.name = "indirect",
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.val = 'I',
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},
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{
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.name = "no-indirect",
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.val = 'i',
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},
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{
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}
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};
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static void help()
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{
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fprintf(stderr, "Usage: virtio_test [--help] [--no-indirect]\n");
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}
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int main(int argc, char **argv)
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{
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struct vdev_info dev;
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unsigned long long features = 1ULL << VIRTIO_RING_F_INDIRECT_DESC;
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int o;
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for (;;) {
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o = getopt_long(argc, argv, optstring, longopts, NULL);
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switch (o) {
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case -1:
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goto done;
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case '?':
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help();
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exit(2);
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case 'h':
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help();
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goto done;
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case 'i':
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features &= ~(1ULL << VIRTIO_RING_F_INDIRECT_DESC);
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break;
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default:
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assert(0);
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break;
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}
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}
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done:
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vdev_info_init(&dev, features);
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vq_info_add(&dev, 256);
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run_test(&dev, &dev.vqs[0], 0x100000);
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return 0;
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}
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