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virtio-net: napi helper functions

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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@google.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Willem de Bruijn 2017-04-24 13:49:26 -04:00 committed by David S. Miller
parent 14933dc8d9
commit e4e8452a4a
1 changed files with 35 additions and 30 deletions
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65
drivers/net/virtio_net.c
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@ -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);