Add disable/enable device API.
Change-Id: I3eac3bce8f918a0fb03b8169eba47eea4211a306
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Xinran Wang
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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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Add disable/enable device API
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=============================
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https://blueprints.launchpad.net/openstack-cyborg/+spec/disable-enable-device
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Nowadays, Cyborg discover the device on compute node by each driver. All
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devices matching the spec of driver are discovered and reported to the
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Placement service as an accelerator resources.
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This spec proposes a set of new APIs which allow admin users to
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disable/enable a device.
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Problem description
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===================
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Cyborg maintains a configuration files to configure the enabled drivers. Once
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the driver is enabled, the driver will discover all devices whose vendor ID,
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device ID match the driver's requirement. If admin user do not want all devices
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to be used by virtual machine, there is no way to disable a device currently.
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Use Cases
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---------
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* Alice is an admin user, she wants some FPGAs to be reserved for its own use
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and not allow them to be allocated to a VM at the time. For example, she
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wants to program the FPGA device and use it as the OVS agent running on
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the host.
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Proposed change
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===============
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* Since the API layer is modified, a new microversion should be introduced.
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* It also need a new field in Device object and data model to indicate the
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status of a device. If one device is disabled, the status should be set
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to "maintaining", and if the device is enabled, the status should be set to
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"enabled". The default value should be "enabled".
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* Cyborg need call Placement API to update the "reserved" field for the
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device.
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Alternatives
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------------
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None
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Data model impact
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-----------------
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A new column `device_status` should be added in Device's data model.
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REST API impact
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---------------
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A microversion need to be introduced since the Device API changed.
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List Device API
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^^^^^^^^^^^^^^^
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* Return a device list
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URL: ``/devices``
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METHOD: ``GET``
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Return: 200
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.. code-block::
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{
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"devices":
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[
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{
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"uuid": "359c0990-0258-44fd-8b05-fc510ac3d022",
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"type": "FPGA",
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"vendor": "0xABCD",
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"model": "miss model info",
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"std_board_info": "{'device_id': '0xabcd', 'class': 'Fake class'}",
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"vendor_board_info": "fake_vendor_info",
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"hostname": "computenode",
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"device_status": "Enabled"
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"created_at": "2020-03-13T02:26:31+00:00",
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"updated_at": null,
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"links":
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[
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{
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"href": "http://localhost/accelerator/v2/devices/359c0990-0258-44fd-8b05-fc510ac3d022",
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"rel": "self"
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}
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]
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}
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]
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}
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Get Device API
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^^^^^^^^^^^^^^
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* Get a device by uuid and return the details
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URL: ``/devices/{uuid}``
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METHOD: ``GET``
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Return: 200
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.. code-block::
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{
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"uuid": "29e23349-12ee-4978-963c-11484a4ae601",
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"parent_id": null,
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"root_id": null,
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"name": "computenode_FakeDevice",
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"num_accelerators": 16,
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"device_id": 1,
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"attributes_list": "[{'traits1': 'CUSTOM_FAKE_DEVICE'}, {'rc': 'FPGA'}]",
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"rp_uuid": "853f07a6-19de-3dd6-b9f6-6c782daa3f7b",
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"driver_name": "fake",
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"device_status": "Enabled"
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"bitstream_id": null,
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"created_at": "2020-03-13T02:27:35+00:00",
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"updated_at": "2020-03-13T02:27:36+00:00",
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"links":
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[
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{
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"href": "http://localhost/accelerator/v2/deployables/29e23349-12ee-4978-963c-11484a4ae601",
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"rel": "self"
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},
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{
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"href": "http://localhost/accelerator/deployables/29e23349-12ee-4978-963c-11484a4ae601",
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"rel": "bookmark"
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}
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]
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}
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Disable Device API
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^^^^^^^^^^^^^^^^^^
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* Disable a device
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URL: ``/devices/disable/{device_uuid}``
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METHOD: ``POST``
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Return: 200
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Error Code: 404(the device is not found),403(the role is not admin)
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Enable Device API
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^^^^^^^^^^^^^^^^^
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* Enable a device
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URL: ``/devices/enable/{device_uuid}``
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METHOD: ``POST``
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Return: 200
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Error Code: 404(the device is not found),403(the role is not admin)
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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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The deployer need update Cyborg to the microversion which supports
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disable/enable API. Otherwise the disable/enable API will be rejected.
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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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Xinran Wang(xin-ran.wang@intel.com)
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Work Items
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----------
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* Add new column `device_status` for device table.
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* Add disable/enable API in DeviceController.
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* Update the RP `reserved` field according to the operation. For `disable`
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oparation, the `reserved` field need be set by the same value as the
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`total` field, and for `enable` operation, the `reserved` field will be set
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to zero.
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* Update GET/LIST device API with `device_status` field added in returned
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value.
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* Add disable/enable operation in cyborgclient.
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* Add unit tests.
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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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Need add unit test, and tempest test if needed.
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Documentation Impact
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====================
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Need add related docs.
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References
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==========
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None
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History
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=======
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Optional section intended to be used each time the spec is updated to describe
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new design, API or any database schema updated. Useful to let reader understand
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what's happened along the time.
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.. list-table:: Revisions
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:header-rows: 1
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* - Release Name
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- Description
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* - Xena
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- Introduced
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