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+---
+title: IB VF GUID Configuration
+authors:
+  - almaslennikov
+reviewers:
+  - SchSeba
+  - adrianchiris
+creation-date: 11-03-2024
+last-updated: 13-03-2024
+---
+
+# IB VF GUID Configuration
+
+## Summary
+Allow SR-IOV Network Operator to use a static configuration file from the host filesystem to assign GUIDs to IB VFs
+
+## Motivation
+We have customers using the SR-IOV operator to create IB VFs, and they need a way to automate GUID assignment,
+so that IB VFs are automatically bound to the required PKeys and no additional manual configuration is needed.
+In this use case, the GUID configuration is static and known in advance.
+Now the GUIDs are assigned by the sriov-network-config-daemon randomly.
+
+### Use Cases
+
+### Goals
+
+* IB GUID configuration can be read from a static json file on the host
+* IB GUID configuration is static and created in advance
+* Static config file is available at the same path on every host
+
+### Non-Goals
+
+* Dynamic GUID allocation is out of scope of this proposal
+
+## Proposal
+
+Mount a configuration file as a part of `/host` hostPath in the config daemon and read it to retrieve the GUID configuration.
+
+### Workflow Description
+
+In the [`pkg/host/internal/sriov/sriov.go:configSriovVFDevices`](https://github.com/k8snetworkplumbingwg/sriov-network-operator/blob/82a6d6fdce71bd88a0d9368fb1750488e9a8e4e2/pkg/host/internal/sriov/sriov.go#L458) read from the static IB config file
+and assign the GUIDs according to the configuration. Each PF is described by either PCI address
+or the PF GUID and has either a list or a range of VF GUIDs.
+
+1. A script creating the config file is deployed to the host and creates a static GUID config file
+2. SR-IOV network operator reads the file and assign GUIDs when IB VFs are created
+3. Users employ [PKey selector](https://github.com/k8snetworkplumbingwg/sriov-network-device-plugin/pull/517) in sriov-network-device-plugin to create PKey-specific resource pools
+4. Users create an IB network CR
+5. Users create pods and request resources from the specific pools
+
+### Implementation Details/Notes/Constraints
+
+There can be fewer VFs created than GUIDs. To persist the dynamic nature of the SR-IOV Network operator,
+it’s proposed not to return an error in this case but assign as many GUIDs as possible.
+To ensure that nothing breaks when users add/remove VFs, the GUID distribution order should always be the same for each individual host.
+
+If there are fewer GUIDs than VFs, then all the GUIDs should be assigned.
+
+### Config file
+
+Example of the config file:
+
+```json
+[
+  {
+    "pci_address": "<pci_address_1>",
+    "guids": [
+      "02:00:00:00:00:00:00:00",
+      "02:00:00:00:00:00:00:01"
+    ]
+  },
+  {
+    "pf_guid": "<pf_guid_2>",
+    "rangeStart": "02:00:00:00:00:aa:00:02",
+    "rangeEnd": "02:00:00:00:00:aa:00:0a"
+  }
+]
+```
+
+Requirements for the config file:
+
+* `pci_adress` and `pf_guid` cannot be set at the same time for a single device - should return an error
+* if the list contains multiple entries for the same device, the first one shall be taken
+* `rangeStart` and `rangeEnd` are both included in the range
+
+### Test Plan
+
+* Unit tests will be implemented for new logic.
+
+## Alternative solution
+
+The alternative solution is also based on the GUID configuration file being deployed on the host.
+The difference here is that GUID assignment is done on the cni level when a VF is allocated to a pod.
+ib-sriov-cni manages a host-local per-PF pool of allocated/free GUIDs and dynamically allocates the next free GUID to an allocated VF.
+
+### Workflow:
+
+1. A script is deployed to the host and creates a static GUID config file
+2. SR-IOV network operator creates IB VFs with random GUIDs (as done now)
+3. ib-sriov-cni is deployed, reads the config file and creates a cached GUID pool
+4. Users create a single resource pool / per PF resource pools for IB VFs
+5. Users create an IB network CR (and provide a PKey here)
+6. Users create a pod requesting an IB VF
+7. ib-sriov-cni allocates a next free GUID from the pool depending on the PKey and assigns it to the allocated VF
+
+## Comparison between the two alternatives
+
+The SR-IOV Network Operator approach:
+* Easier to implement and less error-prone
+* Manages the whole lifecycle of the VF (GUID is assigned at creation and never changes throughout the lifecycle)
+* Operator has better visibility into the amount of configured VFs
+
+The IB-SRIOV-CNI approach:
+* Offers more flexibility (Only when a VF is requested for an IB network will it be assigned a GUID)
+* Easier to maintain complex use cases
+  * 2 PFs on the node evenly split between 2 PKeys. The CNI approach will require 2 per-PF resource pools and 4 network attachments. The operator approach will require 4 resource pools and 4 network attachments, one for each PKey-PF pair.
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