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402 lines
8.8 KiB
402 lines
8.8 KiB
// 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, info->vring, vdev, true, |
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false, 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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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 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(void) |
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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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} |
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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(); |
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exit(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(); |
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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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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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