Re: [Qemu-devel] [RFC v2 0/3] virtio-net: Add support to MTU feature

[Aaron Conole <aconole@redhat.com>]

Maxime Coquelin <maxime.coquelin@redhat.com> writes:

> This series implements Virtio spec update from Aaron Conole which
> defines a way for the host to expose its max MTU to the guest.
>
> Changes since RFC v1:
> ---------------------
>  - Rebased on top of v2.8.0-rc0 (2.7.90)
>  - Write MTU unconditionnaly in netcfg to avoid memory leak (Paolo)
>  - Add host_mtu property to be able to disable the feature from QEMU
>
> Maxime Coquelin (3):
>   vhost-user: Add new protocol feature MTU
>   vhost-net: Add new MTU feature support
>   virtio-net: Add MTU feature support
>
>  hw/net/vhost_net.c             | 11 +++++++++++
>  hw/net/virtio-net.c            | 14 ++++++++++++++
>  hw/virtio/vhost-user.c         | 11 +++++++++++
>  include/hw/virtio/vhost.h      |  1 +
>  include/hw/virtio/virtio-net.h |  1 +
>  include/net/vhost_net.h        |  2 ++
>  6 files changed, 40 insertions(+)

I ran this with a VM, but it seems the offered maximum MTU was of value
0 - is this expected with this version?  How can I change the offered
value?  Sorry, I'm not as familiar with QEMU/libvirt side of the world.

-Aaron