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kvm tools: Support event idx in virtio-net

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Support event idx both when using vhost and when using simple TAP mode.

I did simple TCP stream performance test with vhost, and it showed another 9%
increase over regular vhost mode.

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Sasha Levin
2011-11-17 15:53:25 +02:00
committed by Will Deacon
parent 24a6fb44fb
commit 92c1f37b75
1 changed files with 8 additions and 4 deletions
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virtio/net.c
+8 -4
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@@ -102,7 +102,9 @@ static void *virtio_net_rx_thread(void *p)
virt_queue__set_used_elem(vq, head, len);
/* We should interrupt guest right now, otherwise latency is huge. */
ndev->vtrans.trans_ops->signal_vq(kvm, &ndev->vtrans, VIRTIO_NET_RX_QUEUE);
if (virtio_queue__should_signal(&ndev->vqs[VIRTIO_NET_RX_QUEUE]))
ndev->vtrans.trans_ops->signal_vq(kvm, &ndev->vtrans,
VIRTIO_NET_RX_QUEUE);
}
}
@@ -140,7 +142,8 @@ static void *virtio_net_tx_thread(void *p)
virt_queue__set_used_elem(vq, head, len);
}
ndev->vtrans.trans_ops->signal_vq(kvm, &ndev->vtrans, VIRTIO_NET_TX_QUEUE);
if (virtio_queue__should_signal(&ndev->vqs[VIRTIO_NET_TX_QUEUE]))
ndev->vtrans.trans_ops->signal_vq(kvm, &ndev->vtrans, VIRTIO_NET_TX_QUEUE);
}
pthread_exit(NULL);
@@ -314,7 +317,8 @@ static u32 get_host_features(struct kvm *kvm, void *dev)
| 1UL << VIRTIO_NET_F_HOST_TSO6
| 1UL << VIRTIO_NET_F_GUEST_UFO
| 1UL << VIRTIO_NET_F_GUEST_TSO4
| 1UL << VIRTIO_NET_F_GUEST_TSO6;
| 1UL << VIRTIO_NET_F_GUEST_TSO6
| 1UL << VIRTIO_RING_F_EVENT_IDX;
}
static void set_guest_features(struct kvm *kvm, void *dev, u32 features)
@@ -453,7 +457,7 @@ static struct virtio_ops net_dev_virtio_ops = (struct virtio_ops) {
static void virtio_net__vhost_init(struct kvm *kvm, struct net_dev *ndev)
{
u64 features = 0;
u64 features = 1UL << VIRTIO_RING_F_EVENT_IDX;
struct vhost_memory *mem;
int r;