tripleo-ovs-hw-offload
Adding Spec file for adding ovs-hw_offload functionality to tripleo. This functionality is already available from the Pike release in Open Stack. Herein this specification tries to capture what we need to do to get this functionality within tripleo Change-Id: Iffb9e5eaa9be751fdbca5f20a6750c1b24da1fec
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Moshe Levi
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This work is licensed under a Creative Commons Attribution 3.0 Unported
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License.
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http://creativecommons.org/licenses/by/3.0/legalcode
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==========================================
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Adding OVS Hardware Offload to TripleO
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==========================================
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https://blueprints.launchpad.net/tripleo/+spec/tripleo-ovs-hw-offload
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OVS Hardware Offload leverages SR-IOV technology to control the SR-IOV
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VF using VF representor port. OVS 2.8.0 supports the hw-offload option which
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allows to offload OVS datapath rule to hardware using linux traffic control
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tool and the VF representor port. This feature accelerates the OVS
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with a SR-IOV NIC which support switchdev mode.
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Problem Description
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===================
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Today the installation and configuration of OVS hardware offload feature is
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done manually after overcloud deployment. It shall be automated via tripleo.
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Proposed Change
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===============
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Overview
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--------
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* Configure the SR-IOV NIC to be in switchdev mode using the following
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syntax <physical_interface>:<numvfs>:<mode> for NeutronSriovNumVFs.
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mode can be legacy or switchdev
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* Configure the OVS with other_config:hw-offload. The options can
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be added for the cluster without side effects, because if then NIC doesn't
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support OVS will fall-back to kernel datapath.
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* Nova scheduler should be configured to use the PciPassthroughFilter
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(same SR-IOV)
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* Nova compute should be configured with passthrough_whitelist (same SR-IOV)
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Alternatives
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------------
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None
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Security Impact
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---------------
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None
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Other End User Impact
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---------------------
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None
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Performance Impact
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------------------
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* OVS Hardware Offload leverage the SR-IOV technology to provides near
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native I/O performance for each virtual machine that managed by OpenVswitch.
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Other Deployer Impact
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---------------------
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* The operator shall ensure that the BIOS supports VT-d/IOMMU virtualization
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technology on the compute nodes.
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* IOMMU needs to be enabled in the Compute+SR-IOV nodes. Boot parameters
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(intel_iommu=on or amd_iommu=pt) shall be added in the grub.conf, using the
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PreNetworkConfig.
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* Post deployment, operator shall
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* Create neutron ports prior to creating VM’s (nova boot)
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openstack port create --vnic-type direct --binding-profile '{"capabilities": ["switchdev"]}' port1
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* Create the VM with the required flavor and SR-IOV port id
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openstack server create --image cirros-mellanox_sriov --port=port1 --flavor m1.tiny vm_a1
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Developer Impact
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----------------
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None
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Implementation
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==============
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Assignee(s)
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-----------
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Primary assignee:
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waleedm (waleedm@mellanox.com
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Other contributors:
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moshele (moshele@mellanox.com)
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Work Items
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----------
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* Update tripleo::host::sriov::numvfs_persistence to allow configure SR-IOV
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in switchdev mode. extending the vf_defs to
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<physical_interface>:<numvfs>:<mode>. Mode can be legacy which is default
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SR-IOV or switchdev which is used for ovs hardware offload.
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* Add a template parameter called NeutronOVSHwOffload to enable.
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* provide environment YAML for OVS hardware offload in tripleo-heat-templates.
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Dependencies
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============
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None
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Testing
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=======
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* Since SR-IOV needs specific hardware support, this feature can be tested
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under third party CI. We hope to provide Mellanox CI to SR-IOV and this
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feature.
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Documentation Impact
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====================
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None
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References
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==========
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* Introduction to SR-IOV
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http://goo.gl/m7jP3
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* SR-IOV OVS hardware offload netdevconf
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http://netdevconf.org/1.2/papers/efraim-gerlitz-sriov-ovs-final.pdf
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* OVS hardware offload in OpenVswitch
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https://mail.openvswitch.org/pipermail/ovs-dev/2017-April/330606.html
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* OpenStack OVS mechanism driver support in neutron/nova/os-vif
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https://review.openstack.org/#/c/398265/
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https://review.openstack.org/#/c/275616/
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https://review.openstack.org/#/c/460278/
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