404 lines
8.9 KiB
C
404 lines
8.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#define _GNU_SOURCE
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#include <getopt.h>
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#include <limits.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 <stdbool.h>
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#include <linux/virtio_types.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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#define RANDOM_BATCH -1
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/* Unused */
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void *__kmalloc_fake, *__kfree_ignore_start, *__kfree_ignore_end;
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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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static const struct vhost_vring_file no_backend = { .fd = -1 },
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backend = { .fd = 1 };
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static const struct vhost_vring_state null_state = {};
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bool 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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return true;
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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;
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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_reset(struct vq_info *info, int num, struct virtio_device *vdev)
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{
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if (info->vq)
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vring_del_virtqueue(info->vq);
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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->idx, num, 4096, vdev, true, false,
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info->ring, vq_notify, vq_callback, "test");
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assert(info->vq);
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info->vq->priv = info;
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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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vq_reset(info, num, &dev->vdev);
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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 = features;
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INIT_LIST_HEAD(&dev->vdev.vqs);
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spin_lock_init(&dev->vdev.vqs_list_lock);
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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,
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bool delayed, int batch, int reset_n, int bufs)
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{
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struct scatterlist sl;
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long started = 0, completed = 0, next_reset = reset_n;
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long completed_before, started_before;
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int r, test = 1;
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unsigned int len;
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long long spurious = 0;
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const bool random_batch = batch == RANDOM_BATCH;
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r = ioctl(dev->control, VHOST_TEST_RUN, &test);
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assert(r >= 0);
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if (!reset_n) {
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next_reset = INT_MAX;
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}
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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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started_before = started;
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do {
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const bool reset = completed > next_reset;
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if (random_batch)
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batch = (random() % vq->vring.num) + 1;
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while (started < bufs &&
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(started - completed) < batch) {
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sg_init_one(&sl, dev->buf, dev->buf_size);
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r = virtqueue_add_outbuf(vq->vq, &sl, 1,
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dev->buf + started,
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GFP_ATOMIC);
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if (unlikely(r != 0)) {
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if (r == -ENOSPC &&
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started > started_before)
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r = 0;
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else
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r = -1;
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break;
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}
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++started;
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if (unlikely(!virtqueue_kick(vq->vq))) {
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r = -1;
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break;
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}
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}
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if (started >= bufs)
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r = -1;
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if (reset) {
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r = ioctl(dev->control, VHOST_TEST_SET_BACKEND,
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&no_backend);
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assert(!r);
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}
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/* Flush out completed bufs if any */
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while (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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if (reset) {
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struct vhost_vring_state s = { .index = 0 };
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vq_reset(vq, vq->vring.num, &dev->vdev);
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r = ioctl(dev->control, VHOST_GET_VRING_BASE,
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&s);
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assert(!r);
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s.num = 0;
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r = ioctl(dev->control, VHOST_SET_VRING_BASE,
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&null_state);
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assert(!r);
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r = ioctl(dev->control, VHOST_TEST_SET_BACKEND,
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&backend);
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assert(!r);
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started = completed;
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while (completed > next_reset)
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next_reset += completed;
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}
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} while (r == 0);
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if (completed == completed_before && started == started_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 (delayed) {
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if (virtqueue_enable_cb_delayed(vq->vq))
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wait_for_interrupt(dev);
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} else {
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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,
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"spurious wakeups: 0x%llx started=0x%lx completed=0x%lx\n",
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spurious, started, completed);
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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 = "event-idx",
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.val = 'E',
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},
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{
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.name = "no-event-idx",
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.val = 'e',
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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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.name = "virtio-1",
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.val = '1',
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},
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{
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.name = "no-virtio-1",
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.val = '0',
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},
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{
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.name = "delayed-interrupt",
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.val = 'D',
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},
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{
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.name = "no-delayed-interrupt",
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.val = 'd',
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},
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{
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.name = "batch",
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.val = 'b',
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.has_arg = required_argument,
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},
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{
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.name = "reset",
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.val = 'r',
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.has_arg = optional_argument,
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},
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{
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}
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};
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static void help(int status)
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{
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fprintf(stderr, "Usage: virtio_test [--help]"
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" [--no-indirect]"
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" [--no-event-idx]"
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" [--no-virtio-1]"
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" [--delayed-interrupt]"
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" [--batch=random/N]"
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" [--reset=N]"
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"\n");
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exit(status);
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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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(1ULL << VIRTIO_RING_F_EVENT_IDX) | (1ULL << VIRTIO_F_VERSION_1);
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long batch = 1, reset = 0;
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int o;
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bool delayed = false;
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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(2);
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case 'e':
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features &= ~(1ULL << VIRTIO_RING_F_EVENT_IDX);
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break;
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case 'h':
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help(0);
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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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case '0':
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features &= ~(1ULL << VIRTIO_F_VERSION_1);
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break;
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case 'D':
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delayed = true;
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break;
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case 'b':
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if (0 == strcmp(optarg, "random")) {
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batch = RANDOM_BATCH;
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} else {
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batch = strtol(optarg, NULL, 10);
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assert(batch > 0);
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assert(batch < (long)INT_MAX + 1);
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}
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break;
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case 'r':
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if (!optarg) {
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reset = 1;
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} else {
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reset = strtol(optarg, NULL, 10);
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assert(reset > 0);
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assert(reset < (long)INT_MAX + 1);
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}
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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], delayed, batch, reset, 0x100000);
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return 0;
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}
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