linux-kernel - [PATCH 3.16 64/83] vhost/test: fix build for vhost test

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Date:   Wed, 20 Nov 2019 15:38:14 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        "Tiwei Bie" <tiwei.bie@...el.com>,
        "Jason Wang" <jasowang@...hat.com>
Subject: [PATCH 3.16 64/83] vhost/test: fix build for vhost test

3.16.78-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Tiwei Bie <tiwei.bie@...el.com>

commit 264b563b8675771834419057cbe076c1a41fb666 upstream.

Since vhost_exceeds_weight() was introduced, callers need to specify
the packet weight and byte weight in vhost_dev_init(). Note that, the
packet weight isn't counted in this patch to keep the original behavior
unchanged.

Fixes: e82b9b0727ff ("vhost: introduce vhost_exceeds_weight()")
Signed-off-by: Tiwei Bie <tiwei.bie@...el.com>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Acked-by: Jason Wang <jasowang@...hat.com>
[bwh: Backported to 3.16: vhost_dev_init() still doesn't take an iov_limit
 parameter.]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/vhost/test.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

--- a/drivers/vhost/test.c
+++ b/drivers/vhost/test.c
@@ -23,6 +23,12 @@
  * Using this limit prevents one virtqueue from starving others. */
 #define VHOST_TEST_WEIGHT 0x80000
 
+/* Max number of packets transferred before requeueing the job.
+ * Using this limit prevents one virtqueue from starving others with
+ * pkts.
+ */
+#define VHOST_TEST_PKT_WEIGHT 256
+
 enum {
 	VHOST_TEST_VQ = 0,
 	VHOST_TEST_VQ_MAX = 1,
@@ -81,10 +87,8 @@ static void handle_vq(struct vhost_test
 		}
 		vhost_add_used_and_signal(&n->dev, vq, head, 0);
 		total_len += len;
-		if (unlikely(total_len >= VHOST_TEST_WEIGHT)) {
-			vhost_poll_queue(&vq->poll);
+		if (unlikely(vhost_exceeds_weight(vq, 0, total_len)))
 			break;
-		}
 	}
 
 	mutex_unlock(&vq->mutex);
@@ -116,7 +120,8 @@ static int vhost_test_open(struct inode
 	dev = &n->dev;
 	vqs[VHOST_TEST_VQ] = &n->vqs[VHOST_TEST_VQ];
 	n->vqs[VHOST_TEST_VQ].handle_kick = handle_vq_kick;
-	vhost_dev_init(dev, vqs, VHOST_TEST_VQ_MAX);
+	vhost_dev_init(dev, vqs, VHOST_TEST_VQ_MAX,
+		       VHOST_TEST_PKT_WEIGHT, VHOST_TEST_WEIGHT);
 
 	f->private_data = n;