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-rw-r--r--tools/virtio/virtio_test.c139
1 files changed, 119 insertions, 20 deletions
diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
index b427def67e7e..cb3f29c09aff 100644
--- a/tools/virtio/virtio_test.c
+++ b/tools/virtio/virtio_test.c
@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <getopt.h>
+#include <limits.h>
#include <string.h>
#include <poll.h>
#include <sys/eventfd.h>
@@ -18,6 +19,8 @@
#include <linux/virtio_ring.h>
#include "../../drivers/vhost/test.h"
+#define RANDOM_BATCH -1
+
/* Unused */
void *__kmalloc_fake, *__kfree_ignore_start, *__kfree_ignore_end;
@@ -43,6 +46,10 @@ struct vdev_info {
struct vhost_memory *mem;
};
+static const struct vhost_vring_file no_backend = { .fd = -1 },
+ backend = { .fd = 1 };
+static const struct vhost_vring_state null_state = {};
+
bool vq_notify(struct virtqueue *vq)
{
struct vq_info *info = vq->priv;
@@ -88,6 +95,19 @@ void vhost_vq_setup(struct vdev_info *dev, struct vq_info *info)
assert(r >= 0);
}
+static void vq_reset(struct vq_info *info, int num, struct virtio_device *vdev)
+{
+ if (info->vq)
+ vring_del_virtqueue(info->vq);
+
+ memset(info->ring, 0, vring_size(num, 4096));
+ vring_init(&info->vring, num, info->ring, 4096);
+ info->vq = __vring_new_virtqueue(info->idx, info->vring, vdev, true,
+ false, vq_notify, vq_callback, "test");
+ assert(info->vq);
+ info->vq->priv = info;
+}
+
static void vq_info_add(struct vdev_info *dev, int num)
{
struct vq_info *info = &dev->vqs[dev->nvqs];
@@ -97,14 +117,7 @@ static void vq_info_add(struct vdev_info *dev, int num)
info->call = eventfd(0, EFD_NONBLOCK);
r = posix_memalign(&info->ring, 4096, vring_size(num, 4096));
assert(r >= 0);
- memset(info->ring, 0, vring_size(num, 4096));
- vring_init(&info->vring, num, info->ring, 4096);
- info->vq = vring_new_virtqueue(info->idx,
- info->vring.num, 4096, &dev->vdev,
- true, false, info->ring,
- vq_notify, vq_callback, "test");
- assert(info->vq);
- info->vq->priv = info;
+ vq_reset(info, num, &dev->vdev);
vhost_vq_setup(dev, info);
dev->fds[info->idx].fd = info->call;
dev->fds[info->idx].events = POLLIN;
@@ -116,6 +129,7 @@ static void vdev_info_init(struct vdev_info* dev, unsigned long long features)
int r;
memset(dev, 0, sizeof *dev);
dev->vdev.features = features;
+ INIT_LIST_HEAD(&dev->vdev.vqs);
dev->buf_size = 1024;
dev->buf = malloc(dev->buf_size);
assert(dev->buf);
@@ -152,41 +166,93 @@ static void wait_for_interrupt(struct vdev_info *dev)
}
static void run_test(struct vdev_info *dev, struct vq_info *vq,
- bool delayed, int bufs)
+ bool delayed, int batch, int reset_n, int bufs)
{
struct scatterlist sl;
- long started = 0, completed = 0;
- long completed_before;
+ long started = 0, completed = 0, next_reset = reset_n;
+ long completed_before, started_before;
int r, test = 1;
unsigned len;
long long spurious = 0;
+ const bool random_batch = batch == RANDOM_BATCH;
+
r = ioctl(dev->control, VHOST_TEST_RUN, &test);
assert(r >= 0);
+ if (!reset_n) {
+ next_reset = INT_MAX;
+ }
+
for (;;) {
virtqueue_disable_cb(vq->vq);
completed_before = completed;
+ started_before = started;
do {
- if (started < bufs) {
+ const bool reset = completed > next_reset;
+ if (random_batch)
+ batch = (random() % vq->vring.num) + 1;
+
+ while (started < bufs &&
+ (started - completed) < batch) {
sg_init_one(&sl, dev->buf, dev->buf_size);
r = virtqueue_add_outbuf(vq->vq, &sl, 1,
dev->buf + started,
GFP_ATOMIC);
- if (likely(r == 0)) {
- ++started;
- if (unlikely(!virtqueue_kick(vq->vq)))
+ if (unlikely(r != 0)) {
+ if (r == -ENOSPC &&
+ started > started_before)
+ r = 0;
+ else
r = -1;
+ break;
}
- } else
+
+ ++started;
+
+ if (unlikely(!virtqueue_kick(vq->vq))) {
+ r = -1;
+ break;
+ }
+ }
+
+ if (started >= bufs)
r = -1;
+ if (reset) {
+ r = ioctl(dev->control, VHOST_TEST_SET_BACKEND,
+ &no_backend);
+ assert(!r);
+ }
+
/* Flush out completed bufs if any */
- if (virtqueue_get_buf(vq->vq, &len)) {
+ while (virtqueue_get_buf(vq->vq, &len)) {
++completed;
r = 0;
}
+ if (reset) {
+ struct vhost_vring_state s = { .index = 0 };
+
+ vq_reset(vq, vq->vring.num, &dev->vdev);
+
+ r = ioctl(dev->control, VHOST_GET_VRING_BASE,
+ &s);
+ assert(!r);
+
+ s.num = 0;
+ r = ioctl(dev->control, VHOST_SET_VRING_BASE,
+ &null_state);
+ assert(!r);
+
+ r = ioctl(dev->control, VHOST_TEST_SET_BACKEND,
+ &backend);
+ assert(!r);
+
+ started = completed;
+ while (completed > next_reset)
+ next_reset += completed;
+ }
} while (r == 0);
- if (completed == completed_before)
+ if (completed == completed_before && started == started_before)
++spurious;
assert(completed <= bufs);
assert(started <= bufs);
@@ -203,7 +269,9 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
test = 0;
r = ioctl(dev->control, VHOST_TEST_RUN, &test);
assert(r >= 0);
- fprintf(stderr, "spurious wakeups: 0x%llx\n", spurious);
+ fprintf(stderr,
+ "spurious wakeups: 0x%llx started=0x%lx completed=0x%lx\n",
+ spurious, started, completed);
}
const char optstring[] = "h";
@@ -245,6 +313,16 @@ const struct option longopts[] = {
.val = 'd',
},
{
+ .name = "batch",
+ .val = 'b',
+ .has_arg = required_argument,
+ },
+ {
+ .name = "reset",
+ .val = 'r',
+ .has_arg = optional_argument,
+ },
+ {
}
};
@@ -255,6 +333,8 @@ static void help(void)
" [--no-event-idx]"
" [--no-virtio-1]"
" [--delayed-interrupt]"
+ " [--batch=random/N]"
+ " [--reset=N]"
"\n");
}
@@ -263,6 +343,7 @@ int main(int argc, char **argv)
struct vdev_info dev;
unsigned long long features = (1ULL << VIRTIO_RING_F_INDIRECT_DESC) |
(1ULL << VIRTIO_RING_F_EVENT_IDX) | (1ULL << VIRTIO_F_VERSION_1);
+ long batch = 1, reset = 0;
int o;
bool delayed = false;
@@ -289,6 +370,24 @@ int main(int argc, char **argv)
case 'D':
delayed = true;
break;
+ case 'b':
+ if (0 == strcmp(optarg, "random")) {
+ batch = RANDOM_BATCH;
+ } else {
+ batch = strtol(optarg, NULL, 10);
+ assert(batch > 0);
+ assert(batch < (long)INT_MAX + 1);
+ }
+ break;
+ case 'r':
+ if (!optarg) {
+ reset = 1;
+ } else {
+ reset = strtol(optarg, NULL, 10);
+ assert(reset > 0);
+ assert(reset < (long)INT_MAX + 1);
+ }
+ break;
default:
assert(0);
break;
@@ -298,6 +397,6 @@ int main(int argc, char **argv)
done:
vdev_info_init(&dev, features);
vq_info_add(&dev, 256);
- run_test(&dev, &dev.vqs[0], delayed, 0x100000);
+ run_test(&dev, &dev.vqs[0], delayed, batch, reset, 0x100000);
return 0;
}
generated by cgit v1.2.3 (git 2.46.0) at 2025-11-04 02:39:27 +0000