[RFC PATCH 22/24] vdpa_sim: factor out buffer completion logic

Jason Wang
2020-09-24T03:21:23Z

This patch factors out the buffer completion logic in order to support
future features.

Signed-off-by: Jason Wang <jasowang at redhat.com>
---
 drivers/vdpa/vdpa_sim/vdpa_sim.c | 33 +++++++++++++++++---------------
 1 file changed, 18 insertions(+), 15 deletions(-)

diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index ca5c2d0db905..b21670e054ba 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -155,6 +155,22 @@ static void vdpasim_reset(struct vdpasim *vdpasim)
 	++vdpasim->generation;
 }

+static void vdpasim_complete(struct vdpasim_virtqueue *vq, size_t len)
+{
+	/* Make sure data is wrote before advancing index */
+	smp_wmb();
+
+	vringh_complete_iotlb(&vq->vring, vq->head, len);
+
+	/* Make sure used is visible before rasing the interrupt. */
+	smp_wmb();
+
+	local_bh_disable();
+	if (vq->cb)
+		vq->cb(vq->private);
+	local_bh_enable();
+}
+
 static void vdpasim_work(struct work_struct *work)
 {
 	struct vdpasim *vdpasim = container_of(work, struct
@@ -203,21 +219,8 @@ static void vdpasim_work(struct work_struct *work)
 			total_write += write;
 		}

-		/* Make sure data is wrote before advancing index */
-		smp_wmb();
-
-		vringh_complete_iotlb(&txq->vring, txq->head, 0);
-		vringh_complete_iotlb(&rxq->vring, rxq->head, total_write);
-
-		/* Make sure used is visible before rasing the interrupt. */
-		smp_wmb();
-
-		local_bh_disable();
-		if (txq->cb)
-			txq->cb(txq->private);
-		if (rxq->cb)
-			rxq->cb(rxq->private);
-		local_bh_enable();
+		vdpasim_complete(txq, 0);
+		vdpasim_complete(rxq, total_write);

 		if (++pkts > 4) {
 			schedule_work(&vdpasim->work);
--
2.20.1