d6fb867888
Removed duplicate abbrev definitions Signed-off-by: Rafael Jardim <rafaeljordao.jardim@windriver.com> Change-Id: I7910d9f54e158250004abd7e17a4e119f8064252 Signed-off-by: Ron Stone <ronald.stone@windriver.com>
65 lines
2.4 KiB
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65 lines
2.4 KiB
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.. pqu1596720884619
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.. _pci-passthrough-ethernet-interface-devices:
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==========================================
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PCI Passthrough Ethernet Interface Devices
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==========================================
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For all purposes, a |PCI| passthrough interface behaves as if it were physically
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attached to the virtual machine.
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Therefore, any potential throughput limitations coming from the virtualized
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environment, such as the ones introduced by internal copying of data buffers,
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are eliminated. However, by bypassing the virtualized environment, the use of
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|PCI| passthrough Ethernet devices introduces several restrictions that must be
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taken into consideration. They include:
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.. _pci-passthrough-ethernet-interface-devices-ul-mjs-m52-tp:
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- no support for |LAG|, |QoS|, |ACL|, or host interface monitoring
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- no support for live migration
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.. only:: partner
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.. include:: ../../_includes/pci-passthrough-ethernet-interface-devices.rest
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:start-after: avs-bullet-3-begin
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:end-before: avs-bullet-3-end
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.. only:: starlingx
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A passthrough interface is attached directly to the provider network's
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access switch. Therefore, proper routing of traffic to connect the
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passthrough interface to a particular project network depends entirely on
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the |VLAN| tagging options configured on both the passthrough interface and
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the access port on the switch.
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.. only:: partner
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.. include:: ../../_includes/pci-passthrough-ethernet-interface-devices.rest
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:start-after: avs-text-begin
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:end-before: avs-text-end
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The access switch routes incoming traffic based on a |VLAN| ID, which ultimately
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determines the project network to which the traffic belongs. The |VLAN| ID is
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either explicit, as found in incoming tagged packets, or implicit, as defined
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by the access port's default |VLAN| ID when the incoming packets are untagged. In
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both cases the access switch must be configured to process the proper |VLAN| ID,
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which therefore has to be known in advance.
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.. caution::
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On cold migration, a |PCI| passthrough interface receives a new |MAC| address,
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and therefore a new **eth** x interface. The IP address is retained.
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In the following example a new virtual machine is launched by user **user1** on
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project **project1**, with a passthrough interface connected to the project
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network **net0** identified with |VLAN| ID 10. See :ref:`Configure PCI
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Passthrough ethernet Interfaces <configure-pci-passthrough-ethernet-interfaces>`
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