1d222ac16f
In I808227fe71210abc64270f53ef3d3d62f176ff24 we approved to remove the Priorities section. Now it's a cleanup for the already accepted specs. Change-Id: I6bf243ca114a72cd71aa97491eb528312c53a0dd
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3.4 KiB
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150 lines
3.4 KiB
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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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PCI Pass-through Whitelist Regex
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==========================================
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https://blueprints.launchpad.net/nova/+spec/pci-passthrough-whitelist-regex
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Enhance PCI pass-through whitelist to support regular expression for address
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attributes.
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Problem description
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===================
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Current PCI pass-through whitelist address entry is defined as:
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["address": "[[[[<domain>]:]<bus>]:][<slot>][.[<function>]]",
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where the address uses the same syntax as it's in lspci or
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aggregated declaration of PCI devices by using '*'. Therefore there
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is no way to exclude specific VF(s) from the PCI pass-through whitelist
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address.
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Use Cases
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----------
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Deployer may want to exclude specific VF(s) to be used for other purposes.
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For instance VF can be used to connect compute node to storage node
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by running iSER (iSCSI Extensions for RDMA) transport.
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Proposed change
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===============
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Enhance PCI pass-through whitelist to support regular expression syntax for
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address attributes.
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A new syntax will be introduced for the address key:
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"address":{ "domain": <domain>, "bus": <bus>, "slot": <slot>, \
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"function": <function> }
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The traditional glob style will still be supported:
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"address": "<domain>:<bus>:<slot>.<function>"
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Example for the regular expression syntax:
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This allows allocation of VFs whose functions are from 2 upwards:
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pci_passthrough_whitelist= \
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{"address":{"domain": ".*", "bus": "02", "slot": "01", "function": "[2-7]"}, \
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"physical_network":"net1"}
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This allows allocation of VFs whose functions are from 2 downwards:
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pci_passthrough_whitelist= \
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{"address":{"domain": ".*", "bus": "02", "slot": "01", "function": "[0-2]"}, \
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"physical_network":"net1"}
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This allows allocation of VFs whose slots are between 1 and 2:
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pci_passthrough_whitelist= \
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{"address":{"domain": ".*", "bus": "02", "slot": "0[1-2]", "function": ".*"}, \
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"physical_network":"net1"}
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Alternatives
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------------
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* Instead of whitelist regular expression we could add multiple PCI
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pass-through whitelist entries per host. These entries include all
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the VFs that can be used. This is already supported.
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* Instead of whitelist regular expression we could add PCI pass-through
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blacklist to sit alongside the whitelist to exclude specific PCI addresses.
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Data model impact
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-----------------
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None
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REST API impact
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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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Notifications 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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None
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Other deployer impact
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---------------------
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None
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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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moshele (moshele@mellanox.com)
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Work Items
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----------
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* Add regular expression syntax support to PciAddress in devspec.py.
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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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* Unit tests will be added.
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* Mellanox third party CI will be updated to test this feature.
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https://wiki.openstack.org/wiki/ThirdPartySystems/Mellanox_CI
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Documentation Impact
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====================
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Added regular expression syntax to pci_passthrough_whitelist entry
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as documented above.
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References
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==========
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[1] https://review.openstack.org/#/c/99043/
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[2] https://wiki.openstack.org/wiki/SR-IOV-Passthrough-For-Networking
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