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  1. OASIS Virtual I/O Device (VIRTIO) TC
  2. VIRTIO-152

exposing host MTU to guest

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    Details

    • Type: New Feature
    • Status: Resolved
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: virtio 1.0 cs04
    • Fix Version/s: virtio 1.1 cs01
    • Labels:
      None
    • Environment:

      Aaron Conole <aconole@redhat.com>

    • Proposal:
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      http://marc.info/?i=1474307357-13816-1-git-send-email-aconole@redhat.com

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      http://marc.info/?i=1474307357-13816-1-git-send-email-aconole@redhat.com
    • Resolution:
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      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.

      git-svn-id: https://tools.oasis-open.org/version-control/svn/virtio/trunk@585 0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652

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      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. git-svn-id: https://tools.oasis-open.org/version-control/svn/virtio/trunk@585 0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652

      Description

      It is helpful for a host to indicate its MTU value to the guest.

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            • Assignee:
              Unassigned
              Reporter:
              mstsirkin Michael S. Tsirkin
            • Watchers:
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              Dates

              • Created:
                Updated:
                Resolved: