linux-kernel - [PATCH RFC v5 10/13] vhost/test: convert to the buf API

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Message-ID: <20200607141057.704085-11-mst@redhat.com>
Date:   Sun, 7 Jun 2020 10:11:44 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, Jason Wang <jasowang@...hat.com>,
        eperezma@...hat.com
Subject: [PATCH RFC v5 10/13] vhost/test: convert to the buf API

Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 drivers/vhost/test.c | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/vhost/test.c b/drivers/vhost/test.c
index 02806d6f84ef..251fd2bf74a3 100644
--- a/drivers/vhost/test.c
+++ b/drivers/vhost/test.c
@@ -44,9 +44,10 @@ static void handle_vq(struct vhost_test *n)
 {
 	struct vhost_virtqueue *vq = &n->vqs[VHOST_TEST_VQ];
 	unsigned out, in;
-	int head;
+	int ret;
 	size_t len, total_len = 0;
 	void *private;
+	struct vhost_buf buf;
 
 	mutex_lock(&vq->mutex);
 	private = vhost_vq_get_backend(vq);
@@ -58,15 +59,15 @@ static void handle_vq(struct vhost_test *n)
 	vhost_disable_notify(&n->dev, vq);
 
 	for (;;) {
-		head = vhost_get_vq_desc(vq, vq->iov,
-					 ARRAY_SIZE(vq->iov),
-					 &out, &in,
-					 NULL, NULL);
+		ret = vhost_get_avail_buf(vq, vq->iov, &buf,
+					  ARRAY_SIZE(vq->iov),
+					  &out, &in,
+					  NULL, NULL);
 		/* On error, stop handling until the next kick. */
-		if (unlikely(head < 0))
+		if (unlikely(ret < 0))
 			break;
 		/* Nothing new?  Wait for eventfd to tell us they refilled. */
-		if (head == vq->num) {
+		if (!ret) {
 			if (unlikely(vhost_enable_notify(&n->dev, vq))) {
 				vhost_disable_notify(&n->dev, vq);
 				continue;
@@ -78,13 +79,14 @@ static void handle_vq(struct vhost_test *n)
 			       "out %d, int %d\n", out, in);
 			break;
 		}
-		len = iov_length(vq->iov, out);
+		len = buf.out_len;
 		/* Sanity check */
 		if (!len) {
 			vq_err(vq, "Unexpected 0 len for TX\n");
 			break;
 		}
-		vhost_add_used_and_signal(&n->dev, vq, head, 0);
+		vhost_put_used_buf(vq, &buf);
+		vhost_signal(&n->dev, vq);
 		total_len += len;
 		if (unlikely(vhost_exceeds_weight(vq, 0, total_len)))
 			break;
-- 
MST