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tools/virtio: Add --batch=random option 

So we can test with non-deterministic batches in flight.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Link: https://lore.kernel.org/r/20200418102217.32327-4-eperezma@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Eugenio Pérez 2020-04-18 12:22:12 +02:00 committed by Michael S. Tsirkin
parent 633fae33d5
commit 7add78b2a6
1 changed files with 14 additions and 4 deletions
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18
tools/virtio/virtio_test.c
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@ -19,6 +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;
@ -161,6 +163,7 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
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);
for (;;) {
@ -168,6 +171,9 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
completed_before = completed;
started_before = started;
do {
if (random_batch)
batch = (random() % vq->vring.num) + 1;
while (started < bufs &&
(started - completed) < batch) {
sg_init_one(&sl, dev->buf, dev->buf_size);
@ -275,7 +281,7 @@ static void help(void)
" [--no-event-idx]"
" [--no-virtio-1]"
" [--delayed-interrupt]"
" [--batch=N]"
" [--batch=random/N]"
"\n");
}
@ -312,9 +318,13 @@ int main(int argc, char **argv)
delayed = true;
break;
case 'b':
batch = strtol(optarg, NULL, 10);
assert(batch > 0);
assert(batch < (long)INT_MAX + 1);
if (0 == strcmp(optarg, "random")) {
batch = RANDOM_BATCH;
} else {
batch = strtol(optarg, NULL, 10);
assert(batch > 0);
assert(batch < (long)INT_MAX + 1);
}
break;
default:
assert(0);