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vhost-net: Notify the backend about the host MTU

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This patch provides a way for virtio-net to notify the
backend about the host MTU set by the user.

Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Aaron Conole <aconole@redhat.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Maxime Coquelin 2016-12-10 16:30:37 +01:00 committed by Michael S. Tsirkin
parent c5f048d8fb
commit 45a368ad4f
2 changed files with 20 additions and 0 deletions
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18
hw/net/vhost_net.c
View File

@ -51,6 +51,7 @@ static const int kernel_feature_bits[] = {
VIRTIO_RING_F_EVENT_IDX, VIRTIO_RING_F_EVENT_IDX,
VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_MRG_RXBUF,
VIRTIO_F_VERSION_1, VIRTIO_F_VERSION_1,
VIRTIO_NET_F_MTU,
VHOST_INVALID_FEATURE_BIT VHOST_INVALID_FEATURE_BIT
}; };
@ -74,6 +75,7 @@ static const int user_feature_bits[] = {
VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_HOST_ECN,
VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_UFO,
VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_MRG_RXBUF,
VIRTIO_NET_F_MTU,
/* This bit implies RARP isn't sent by QEMU out of band */ /* This bit implies RARP isn't sent by QEMU out of band */
VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_GUEST_ANNOUNCE,
@ -435,6 +437,17 @@ int vhost_set_vring_enable(NetClientState *nc, int enable)
return 0; return 0;
} }
int vhost_net_set_mtu(struct vhost_net *net, uint16_t mtu)
{
const VhostOps *vhost_ops = net->dev.vhost_ops;
if (!vhost_ops->vhost_net_set_mtu) {
return 0;
}
return vhost_ops->vhost_net_set_mtu(&net->dev, mtu);
}
#else #else
uint64_t vhost_net_get_max_queues(VHostNetState *net) uint64_t vhost_net_get_max_queues(VHostNetState *net)
{ {
@ -501,4 +514,9 @@ int vhost_set_vring_enable(NetClientState *nc, int enable)
{ {
return 0; return 0;
} }
int vhost_net_set_mtu(struct vhost_net *net, uint16_t mtu)
{
return 0;
}
#endif #endif

2
include/net/vhost_net.h
View File

@ -35,4 +35,6 @@ int vhost_set_vring_enable(NetClientState * nc, int enable);
uint64_t vhost_net_get_acked_features(VHostNetState *net); uint64_t vhost_net_get_acked_features(VHostNetState *net);
int vhost_net_set_mtu(struct vhost_net *net, uint16_t mtu);
#endif #endif