Description of problem:
It is useful to expose
host MTU to guest. In particular, guest can
then disable guest offloads and be sure that packets
will fit in MTU sized receive buffers,
and / or disable host offloads and still be sure
that packets can be transmitted.
Will need to clone to linux and dpdk down the road.
QEMU RFC v3 sent on the ML:
In this version, the MTU value is specified by the user (management
tool) in QEMU command line via the host_mtu virtio-net parameter.
a93e599 virtio-net: Add MTU feature support
45a368a vhost-net: Notify the backend about the host MTU
c5f048d vhost-user: Add MTU protocol feature and op
Test result can be find in:
Related bug is:
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.