Add doc article

Signed-off-by: amaslennikov <[email protected]>

Author: almaslennikov

doc/ib-vf-guid-static-configuration.md

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+# Infiniband VF GUID Static Configuration
+
+SR-IOV Network Operator is able to use a static configuration file from the host filesystem to assign GUIDs to IB VFs.
+
+## Prerequisites
+
+- Infiniband NICs
+- Static GUID configuration file on the host filesystem
+
+### Configuration file
+
+Config file should be stored at `/etc/sriov-operator/infiniband/guids`. This location is writable across most cloud platforms.
+
+VF to GUID assignment, based on this file, is ordered. VF0 takes the GUID0, VF1 takes the GUID1 etc.
+
+Each PF has its own set of GUIDs.
+
+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>",
+    "guidsRange": {
+      "start": "02:00:00:00:00:aa:00:02",
+      "end": "02:00:00:00:00:aa:00:0a"
+    }
+  }
+]
+```
+
+Config file parameters:
+
+* `pci_address` is a PCI address of a PF
+* `pf_guid` is a GUID of a PF. Can be obtained with `ibstat` command.
+* `guids` is an array of VF GUID strings
+* `guidsRange` is an object representing the start and end of a VF GUID range. It has two fields:
+    * `start` is a VF GUID range start
+    * `end` is a VF GUID range end
+
+Requirements for the config file:
+
+* `pci_address` 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
+* `guids` list and range cannot be both set at the same time for a single device - should return an error
+* GUIDs are assigned once and not change throughout the lifecycle of the host
+
+### Deploy SriovNetworkNodePolicy
+
+```yaml
+apiVersion: sriovnetwork.openshift.io/v1
+kind: SriovNetworkNodePolicy
+metadata:
+  name: ib-policy
+  namespace: sriov-network-operator
+spec:
+  nodeSelector:
+    feature.node.kubernetes.io/network-sriov.capable: "true"
+  resourceName: ib_vfs
+  priority: 10
+  numVfs: 2
+  nicSelector:
+    vendor: "15b3"
+    rootDevices:
+    - 0000:d8.00.0
+  deviceType: netdevice
+```
+
+## Verify assigned GUIDs
+
+Run ip link tool to verify assigned GUIDs:
+
+```bash
+ip link
+
+...
+6: ibp216s0f0: <BROADCAST,MULTICAST> mtu 4092 qdisc noop state UP mode DEFAULT group default qlen 256
+    link/infiniband 00:00:05:a9:fe:80:00:00:00:00:00:00:b8:59:9f:03:00:f9:8f:86 brd 00:ff:ff:ff:ff:12:40:1b:ff:ff:00:00:00:00:00:00:ff:ff:ff:ff
+    vf 0     link/infiniband ... NODE_GUID 02:00:00:00:00:00:00:00, PORT_GUID 02:00:00:00:00:00:00:00, link-state enable, trust off, query_rss off
+    vf 1     link/infiniband ... NODE_GUID 02:00:00:00:00:00:00:01, PORT_GUID 02:00:00:00:00:00:00:01, link-state enable, trust off, query_rss off
+```
+