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vhost-user: fix VIRTIO_NET_F_MRG_RXBUF negotiation

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Header length check should happen only if backend is kernel. For user
backend there is no reason to reset this bit.

vhost-user code does not define .has_vnet_hdr_len so
VIRTIO_NET_F_MRG_RXBUF cannot be negotiated even if both sides
support it.

Signed-off-by: Damjan Marion <damarion@cisco.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Damjan Marion 2014-09-11 14:55:48 -07:00 committed by Michael S. Tsirkin
parent e43c0b2ea5
commit d8e80ae37a
1 changed files with 4 additions and 4 deletions
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2
hw/net/vhost_net.c
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@ -163,11 +163,11 @@ struct vhost_net *vhost_net_init(VhostNetOptions *options)
if (r < 0) {
goto fail;
}
if (backend_kernel) {
if (!qemu_has_vnet_hdr_len(options->net_backend,
sizeof(struct virtio_net_hdr_mrg_rxbuf))) {
net->dev.features &= ~(1 << VIRTIO_NET_F_MRG_RXBUF);
}
if (backend_kernel) {
if (~net->dev.features & net->dev.backend_features) {
fprintf(stderr, "vhost lacks feature mask %" PRIu64
" for backend\n",