[Devel] [PATCH VZ9 04/11] vhost, vhost_net: add helper to check if vq has work

[Andrey Zhadchenko]

From: Mike Christie <michael.christie at oracle.com>

In the next patches each vq might have different workers so one could
have work but others do not. For net, we only want to check specific vqs,
so this adds a helper to check if a vq has work pending and converts
vhost-net to use it.

Signed-off-by: Mike Christie <michael.christie at oracle.com>
Acked-by: Jason Wang <jasowang at redhat.com>
Message-Id: <20230626232307.97930-5-michael.christie at oracle.com>
Signed-off-by: Michael S. Tsirkin <mst at redhat.com>

---------

(cherry picked from ms commit 9784df151a60)
https://virtuozzo.atlassian.net/browse/PSBM-152375
Signed-off-by: Andrey Zhadchenko <andrey.zhadchenko at virtuozzo.com>
---
 drivers/vhost/net.c   | 2 +-
 drivers/vhost/vhost.c | 6 +++---
 drivers/vhost/vhost.h | 2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index c0e660d4626b..6b4583a1a565 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -545,7 +545,7 @@ static void vhost_net_busy_poll(struct vhost_net *net,
 	endtime = busy_clock() + busyloop_timeout;
 
 	while (vhost_can_busy_poll(endtime)) {
-		if (vhost_has_work(&net->dev)) {
+		if (vhost_vq_has_work(vq)) {
 			*busyloop_intr = true;
 			break;
 		}
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index c6054c1429c5..dc8592c411d9 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -266,11 +266,11 @@ bool vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work)
 EXPORT_SYMBOL_GPL(vhost_work_queue);
 
 /* A lockless hint for busy polling code to exit the loop */
-bool vhost_has_work(struct vhost_dev *dev)
+bool vhost_vq_has_work(struct vhost_virtqueue *vq)
 {
-	return dev->worker && !llist_empty(&dev->worker->work_list);
+	return !llist_empty(&vq->worker->work_list);
 }
-EXPORT_SYMBOL_GPL(vhost_has_work);
+EXPORT_SYMBOL_GPL(vhost_vq_has_work);
 
 void vhost_poll_queue(struct vhost_poll *poll)
 {
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index f1f168f4fa85..a76caf82027d 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -45,7 +45,6 @@ struct vhost_poll {
 
 void vhost_work_init(struct vhost_work *work, vhost_work_fn_t fn);
 bool vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work);
-bool vhost_has_work(struct vhost_dev *dev);
 
 void vhost_poll_init(struct vhost_poll *poll, vhost_work_fn_t fn,
 		     __poll_t mask, struct vhost_dev *dev);
@@ -199,6 +198,7 @@ int vhost_get_vq_desc(struct vhost_virtqueue *,
 		      struct vhost_log *log, unsigned int *log_num);
 void vhost_discard_vq_desc(struct vhost_virtqueue *, int n);
 
+bool vhost_vq_has_work(struct vhost_virtqueue *vq);
 bool vhost_vq_is_setup(struct vhost_virtqueue *vq);
 int vhost_vq_init_access(struct vhost_virtqueue *);
 int vhost_add_used(struct vhost_virtqueue *, unsigned int head, int len);
-- 
2.39.3