linux-kernel - [PATCH v2 7/8] tools/virtio: Reset index in virtio

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Date:   Thu, 16 Apr 2020 09:56:42 +0200
From:   Eugenio Pérez <eperezma@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Eugenio Pérez <eperezma@...hat.com>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        kvm list <kvm@...r.kernel.org>,
        Cornelia Huck <cohuck@...hat.com>,
        Halil Pasic <pasic@...ux.ibm.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 7/8] tools/virtio: Reset index in virtio_test --reset.

This way behavior for vhost is more like a VM.

Signed-off-by: Eugenio Pérez <eperezma@...hat.com>
---
 tools/virtio/virtio_test.c | 33 ++++++++++++++++++++++++++-------
 1 file changed, 26 insertions(+), 7 deletions(-)

diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
index 18d5347003eb..dca64d36a882 100644
--- a/tools/virtio/virtio_test.c
+++ b/tools/virtio/virtio_test.c
@@ -20,7 +20,6 @@
 #include "../../drivers/vhost/test.h"
 
 #define RANDOM_BATCH -1
-#define RANDOM_RESET -1
 
 /* Unused */
 void *__kmalloc_fake, *__kfree_ignore_start, *__kfree_ignore_end;
@@ -49,6 +48,7 @@ struct vdev_info {
 
 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)
 {
@@ -174,14 +174,19 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
 	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 {
-			const bool reset = reset_n && completed > next_reset;
+			const bool reset = completed > next_reset;
 			if (random_batch)
 				batch = (random() % vq->vring.num) + 1;
 
@@ -224,10 +229,24 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
 			}
 
 			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;
 			}
@@ -249,7 +268,9 @@ 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";
@@ -312,7 +333,7 @@ static void help(void)
 		" [--no-virtio-1]"
 		" [--delayed-interrupt]"
 		" [--batch=random/N]"
-		" [--reset=random/N]"
+		" [--reset=N]"
 		"\n");
 }
 
@@ -360,11 +381,9 @@ int main(int argc, char **argv)
 		case 'r':
 			if (!optarg) {
 				reset = 1;
-			} else if (0 == strcmp(optarg, "random")) {
-				reset = RANDOM_RESET;
 			} else {
 				reset = strtol(optarg, NULL, 10);
-				assert(reset >= 0);
+				assert(reset > 0);
 				assert(reset < (long)INT_MAX + 1);
 			}
 			break;
-- 
2.18.1