Merge "tripleo-ovs-hw-offload"
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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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