From: Willem de Bruijn <willemb@xxxxxxxxxx>
Prepare virtio-net for tx napi by converting existing napi code to
use helper functions. This also deduplicates some logic.
Signed-off-by: Willem de Bruijn <willemb@xxxxxxxxxx>
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
---
drivers/net/virtio_net.c | 65 ++++++++++++++++++++++++++----------------------
1 file changed, 35 insertions(+), 30 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 666ada6130ab..b9c1df29892c 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -239,6 +239,26 @@ static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask)
return p;
}
+static void virtqueue_napi_schedule(struct napi_struct *napi,
+ struct virtqueue *vq)
+{
+ if (napi_schedule_prep(napi)) {
+ virtqueue_disable_cb(vq);
+ __napi_schedule(napi);
+ }
+}
+
+static void virtqueue_napi_complete(struct napi_struct *napi,
+ struct virtqueue *vq, int processed)
+{
+ int opaque;
+
+ opaque = virtqueue_enable_cb_prepare(vq);
+ if (napi_complete_done(napi, processed) &&
+ unlikely(virtqueue_poll(vq, opaque)))
+ virtqueue_napi_schedule(napi, vq);
+}
+
static void skb_xmit_done(struct virtqueue *vq)
{
struct virtnet_info *vi = vq->vdev->priv;
@@ -936,27 +956,20 @@ static void skb_recv_done(struct virtqueue *rvq)
struct virtnet_info *vi = rvq->vdev->priv;
struct receive_queue *rq = &vi->rq[vq2rxq(rvq)];
- /* Schedule NAPI, Suppress further interrupts if successful. */
- if (napi_schedule_prep(&rq->napi)) {
- virtqueue_disable_cb(rvq);
- __napi_schedule(&rq->napi);
- }
+ virtqueue_napi_schedule(&rq->napi, rvq);
}
-static void virtnet_napi_enable(struct receive_queue *rq)
+static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi)
{
- napi_enable(&rq->napi);
+ napi_enable(napi);
/* If all buffers were filled by other side before we napi_enabled, we
- * won't get another interrupt, so process any outstanding packets
- * now. virtnet_poll wants re-enable the queue, so we disable here.
- * We synchronize against interrupts via NAPI_STATE_SCHED */
- if (napi_schedule_prep(&rq->napi)) {
- virtqueue_disable_cb(rq->vq);
- local_bh_disable();
- __napi_schedule(&rq->napi);
- local_bh_enable();
- }
+ * won't get another interrupt, so process any outstanding packets now.
+ * Call local_bh_enable after to trigger softIRQ processing.
+ */
+ local_bh_disable();
+ virtqueue_napi_schedule(napi, vq);
+ local_bh_enable();
}
static void refill_work(struct work_struct *work)
@@ -971,7 +984,7 @@ static void refill_work(struct work_struct *work)
napi_disable(&rq->napi);
still_empty = !try_fill_recv(vi, rq, GFP_KERNEL);
- virtnet_napi_enable(rq);
+ virtnet_napi_enable(rq->vq, &rq->napi);
/* In theory, this can happen: if we don't get any buffers in
* we will *never* try to fill again.
@@ -1011,21 +1024,13 @@ static int virtnet_poll(struct napi_struct *napi, int budget)
{
struct receive_queue *rq =
container_of(napi, struct receive_queue, napi);
- unsigned int r, received;
+ unsigned int received;
received = virtnet_receive(rq, budget);
/* Out of packets? */
- if (received < budget) {
- r = virtqueue_enable_cb_prepare(rq->vq);
- if (napi_complete_done(napi, received)) {
- if (unlikely(virtqueue_poll(rq->vq, r)) &&
- napi_schedule_prep(napi)) {
- virtqueue_disable_cb(rq->vq);
- __napi_schedule(napi);
- }
- }
- }
+ if (received < budget)
+ virtqueue_napi_complete(napi, rq->vq, received);
return received;
}
@@ -1040,7 +1045,7 @@ static int virtnet_open(struct net_device *dev)
/* Make sure we have some buffers: if oom use wq. */
if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
schedule_delayed_work(&vi->refill, 0);
- virtnet_napi_enable(&vi->rq[i]);
+ virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
}
return 0;
@@ -1747,7 +1752,7 @@ static int virtnet_restore_up(struct virtio_device *vdev)
schedule_delayed_work(&vi->refill, 0);
for (i = 0; i < vi->max_queue_pairs; i++)
- virtnet_napi_enable(&vi->rq[i]);
+ virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
}
netif_device_attach(vi->dev);
--
2.12.2.816.g2cccc81164-goog
_______________________________________________
Virtualization mailing list
Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
