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authormstsirkin <mstsirkin@0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652>2016-10-11 00:58:19 +0000
committermstsirkin <mstsirkin@0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652>2016-10-11 00:58:19 +0000
commit58bc22e83275789987deb80f68743f2916b51ac8 (patch)
tree2f00af36865d6a122b74e6a86c49e6dbc09f7216 /newdevice.tex
parent0e05ee7d90e110c8aae99754cd87b58970449ce2 (diff)
virtio-net: add Max MTU configuration field
It is helpful for a host to indicate it's MTU to be set on guest NICs other than the assumed 1500 byte value. This helps in situations where the host network is using Jumbo Frames, or aiding in PMTU discovery by configuring a homogenous network. It is also helpful for sizing receive buffers correctly. The change adds a new field to configuration area of network devices. It will be used to pass a maximum MTU from the device to the driver. This will be used by the driver as a maximum value for packet sizes during transmission, without segmentation offloading. In addition, in order to support backward and forward compatibility, we introduce a new feature bit called VIRTIO_NET_F_MTU. VIRTIO-152 Signed-off-by: Aaron Conole <aconole@redhat.com> Cc: Victor Kaplansky <victork@redhat.com> Reviewed-by: Hannes Reiencke <hare@suse.de> Acked-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Maxime Coquelin <maxime.coquelin@redhat.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> git-svn-id: https://tools.oasis-open.org/version-control/svn/virtio/trunk@585 0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652
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