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>
62 lines
2.3 KiB
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62 lines
2.3 KiB
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.. vic1596720744539
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.. _pci-sr-iov-ethernet-interface-devices:
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=====================================
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PCI SR-IOV Ethernet Interface Devices
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=====================================
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A |SRIOV| ethernet interface is a physical |PCI| ethernet |NIC| that implements
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hardware-based virtualization mechanisms to expose multiple virtual network
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interfaces that can be used by one or more virtual machines simultaneously.
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The |PCI|-SIG Single Root I/O Virtualization and Sharing \(|SRIOV|\) specification
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defines a standardized mechanism to create individual virtual ethernet devices
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from a single physical ethernet interface. For each exposed virtual ethernet
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device, formally referred to as a Virtual Function \(VF\), the |SRIOV| interface
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provides separate management memory space, work queues, interrupts resources,
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and |DMA| streams, while utilizing common resources behind the host interface.
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Each VF therefore has direct access to the hardware and can be considered to be
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an independent ethernet interface.
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When compared with a |PCI| Passthrough ethernet interface, a |SRIOV| ethernet
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interface:
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.. _pci-sr-iov-ethernet-interface-devices-ul-tyq-ymg-rr:
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- Provides benefits similar to those of a |PCI| Passthrough ethernet interface,
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including lower latency packet processing.
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- Scales up more easily in a virtualized environment by providing multiple
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VFs that can be attached to multiple virtual machine interfaces.
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- Shares the same limitations, including the lack of support for |LAG|, |QoS|,
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|ACL|, and live migration.
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- Has the same requirements regarding the |VLAN| configuration of the access
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switches.
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- Provides a similar configuration workflow when used on |prod-os|.
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The configuration of a |PCI| |SRIOV| ethernet interface is identical to
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:ref:`Configure PCI Passthrough ethernet Interfaces
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<configure-pci-passthrough-ethernet-interfaces>` except that
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.. _pci-sr-iov-ethernet-interface-devices-ul-ikt-nvz-qmb:
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- you use **pci-sriov** instead of **pci-passthrough** when defining the
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network type of an interface
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- the segmentation ID of the project network\(s\) used is more significant
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here since this identifies the particular |VF| of the |SRIOV| interface
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- when creating the neutron port, you must use ``--vnic-typedirect``
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- when creating a neutron port backed by an |SRIOV| |VF|, you must use
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``--vnic-type direct``
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