提交 7b0411ef 编写于 作者: W Willem de Bruijn 提交者: David S. Miller

virtio-net: clean tx descriptors from rx napi

Amortize the cost of virtual interrupts by doing both rx and tx work
on reception of a receive interrupt if tx napi is enabled. With
VIRTIO_F_EVENT_IDX, this suppresses most explicit tx completion
interrupts for bidirectional workloads.
Signed-off-by: NWillem de Bruijn <willemb@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 ea7735d9
......@@ -1075,12 +1075,33 @@ static void free_old_xmit_skbs(struct send_queue *sq)
u64_stats_update_end(&stats->tx_syncp);
}
static void virtnet_poll_cleantx(struct receive_queue *rq)
{
struct virtnet_info *vi = rq->vq->vdev->priv;
unsigned int index = vq2rxq(rq->vq);
struct send_queue *sq = &vi->sq[index];
struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index);
if (!sq->napi.weight)
return;
if (__netif_tx_trylock(txq)) {
free_old_xmit_skbs(sq);
__netif_tx_unlock(txq);
}
if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS)
netif_tx_wake_queue(txq);
}
static int virtnet_poll(struct napi_struct *napi, int budget)
{
struct receive_queue *rq =
container_of(napi, struct receive_queue, napi);
unsigned int received;
virtnet_poll_cleantx(rq);
received = virtnet_receive(rq, budget);
/* Out of packets? */
......
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