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virtio-net: enable tap offload if guest supports it 

We query the guest's feature set to see if it supports offload and,
if so, we enable those features on the tap interface.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
master
Mark McLoughlin 2009-10-22 17:43:47 +01:00 committed by Anthony Liguori
parent b1c28b464d
commit f5436dd96a
1 changed files with 18 additions and 0 deletions
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18
hw/virtio-net.c
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@ -152,6 +152,11 @@ static uint32_t virtio_net_get_features(VirtIODevice *vdev)
features |= (1 << VIRTIO_NET_F_HOST_TSO4);
features |= (1 << VIRTIO_NET_F_HOST_TSO6);
features |= (1 << VIRTIO_NET_F_HOST_ECN);
features |= (1 << VIRTIO_NET_F_GUEST_CSUM);
features |= (1 << VIRTIO_NET_F_GUEST_TSO4);
features |= (1 << VIRTIO_NET_F_GUEST_TSO6);
features |= (1 << VIRTIO_NET_F_GUEST_ECN);
}
return features;
@ -177,6 +182,14 @@ static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
VirtIONet *n = to_virtio_net(vdev);
n->mergeable_rx_bufs = !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF));
if (n->has_vnet_hdr) {
tap_set_offload(n->vc->peer,
(features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
(features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
(features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
(features >> VIRTIO_NET_F_GUEST_ECN) & 1);
}
}
static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
@ -702,6 +715,11 @@ static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
if (n->has_vnet_hdr) {
tap_using_vnet_hdr(n->vc->peer, 1);
tap_set_offload(n->vc->peer,
(n->vdev.features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
(n->vdev.features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
(n->vdev.features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
(n->vdev.features >> VIRTIO_NET_F_GUEST_ECN) & 1);
}
}