Re: [RFC v2 -next 0/2] virtio-net: Advised MTU feature

[Rick Jones]

On 03/15/2016 02:04 PM, Aaron Conole wrote:
> The following series adds the ability for a hypervisor to set an MTU on the
> guest during feature negotiation phase. This is useful for VM orchestration
> when, for instance, tunneling is involved and the MTU of the various systems
> should be homogenous.
>
> The first patch adds the feature bit as described in the proposed VFIO spec
> addition found at
> https://lists.oasis-open.org/archives/virtio-dev/201603/msg00001.html
>
> The second patch adds a user of the bit, and a warning when the guest changes
> the MTU from the hypervisor advised MTU. Future patches may add more thorough
> error handling.

How do you see this interacting with VMs getting MTU settings via DHCP?

rick jones

> v2:
> * Whitespace and code style cleanups from Sergei Shtylyov and Paolo Abeni
> * Additional test before printing a warning
>
> Aaron Conole (2):
>    virtio: Start feature MTU support
>    virtio_net: Read the advised MTU
>
>   drivers/net/virtio_net.c        | 12 ++++++++++++
>   include/uapi/linux/virtio_net.h |  3 +++
>   2 files changed, 15 insertions(+)