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virtio-net: enable tap offload if guest supports it

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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>
This commit is contained in:
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);
}
}