bpfman-operator does not allow priority 0, defaults to 1000 instead

[andreaskaris]

In bpfman, 0 is a valid priority:

[root@centos9-bpfman bpfman]# target/debug/bpfman load image --image-url quay.io/bpfman-bytecode/xdp_pass:lat
est      --programs xdp:pass --application XdpPassProgram
 Bpfman State                                           
 BPF Function:  pass                                    
 Program Type:  xdp                                     
 Image URL:     quay.io/bpfman-bytecode/xdp_pass:latest 
 Pull Policy:   IfNotPresent                            
 Global:        None                                    
 Metadata:      bpfman_application=XdpPassProgram       
 Map Pin Path:  /run/bpfman/fs/maps/262                 
 Map Owner ID:  None                                    
 Maps Used By:  262                                     
 Links:         None                                    

 Kernel State                                               
 Program ID:                       262                      
 BPF Function:                     pass                     
 Kernel Type:                      xdp                      
 Loaded At:                        2025-10-21T10:27:16-0400 
 Tag:                              4b9d1b2c140e87ce         
 GPL Compatible:                   true                     
 Map IDs:                          [45]                     
 BTF ID:                           120                      
 Size Translated (bytes):          96                       
 JITted:                           true                     
 Size JITted:                      68                       
 Kernel Allocated Memory (bytes):  4096                     
 Verified Instruction Count:       9  
[root@centos9-bpfman bpfman]# target/debug/bpfman attach 262 xdp --iface eth1 --priority 0
 Bpfman State                                          
 BPF Function:       pass                              
 Program Type:       xdp                               
 Program ID:         262                               
 Link ID:            3765691113                        
 Interface:          eth1                              
 Priority:           0                                 
 Position:           0                                 
 Proceed On:         pass, dispatcher_return           
 Network Namespace:  None                              
 Metadata:           bpfman_application=XdpPassProgram
[root@centos9-bpfman bpfman]# target/debug/bpfman list programs
 Program ID  Application     Type  Function Name  Links          
 262         XdpPassProgram  xdp   pass           (1) 3765691113 

[root@centos9-bpfman bpfman]# target/debug/bpfman unload 262
[root@centos9-bpfman bpfman]# target/debug/bpfman list links
 Program ID  Link ID  Application  Type  Function Name  Attachment 

[root@centos9-bpfman bpfman]# target/debug/bpfman list programs
 Program ID  Application  Type  Function Name  Links 

Applying with bpfman-operator - -1 is correctly rejected.

[root@centos9-bpfman bpfman]# kubectl apply -f /root/bytecode.yaml 
The ClusterBpfApplication "go-xdp-counter-example" is invalid: spec.programs[0].xdp.links[0].priority: Invalid value: -1: spec.programs[0].xdp.links[0].priority in body should be greater than or equal to 0

Applying with priority 0:

[root@centos9-bpfman bpfman]# vim /root/bytecode.yaml 
[root@centos9-bpfman bpfman]# cat /root/bytecode.yaml 
---
apiVersion: bpfman.io/v1alpha1
kind: ClusterBpfApplication
metadata:
  labels:
    app.kubernetes.io/name: xdpprogram
  name: go-xdp-counter-example
spec:
  # Select all nodes
  nodeSelector: {}
  byteCode:
    image:
      url: quay.io/bpfman-bytecode/go-xdp-counter:latest
  programs:
    - name: xdp_stats
      type: XDP
      xdp:
        links:
          - interfaceSelector:
              primaryNodeInterface: true
            priority: 0
[root@centos9-bpfman bpfman]# kubectl apply -f /root/bytecode.yaml

Yields priority 1000, though:

[root@centos9-bpfman bpfman]# kubectl get clusterbpfapplicationstate -o yaml
apiVersion: v1
items:
- apiVersion: bpfman.io/v1alpha1
  kind: ClusterBpfApplicationState
  metadata:
    creationTimestamp: "2025-10-21T15:49:22Z"
    finalizers:
    - bpfman.io.clbpfapplicationcontroller/finalizer
    generation: 1
    labels:
      bpfman.io/ownedByProgram: go-xdp-counter-example
      kubernetes.io/hostname: bpfman-deployment-control-plane
    name: go-xdp-counter-example-0526083e
    ownerReferences:
    - apiVersion: bpfman.io/v1alpha1
      blockOwnerDeletion: true
      controller: true
      kind: ClusterBpfApplication
      name: go-xdp-counter-example
      uid: 5ae63c5a-8f5e-4e45-ad2f-51f51fd5cb6d
    resourceVersion: "1162"
    uid: ec4250f8-1105-40c4-8b3d-58b4da3284de
  status:
    appLoadStatus: LoadSuccess
    conditions:
    - lastTransitionTime: "2025-10-21T15:49:33Z"
      message: The BPF application has been successfully loaded and attached
      reason: Success
      status: "True"
      type: Success
    node: bpfman-deployment-control-plane
    programs:
    - name: xdp_stats
      programId: 1050
      programLinkStatus: Success
      type: XDP
      xdp:
        links:
        - interfaceName: eth0
          linkId: 873034001
          linkStatus: Attached
          priority: 1000
          proceedOn:
          - Pass
          - DispatcherReturn
          shouldAttach: true
          uuid: 21f86d63-9bd6-41cb-b1ee-9340f4a16ab3
    updateCount: 2
kind: List
metadata:
  resourceVersion: ""

From the container:

root@bpfman-deployment-control-plane:/# ./bpfman get link 873034001 
 Bpfman State                                                            
 BPF Function:       xdp_stats                                           
 Program Type:       xdp                                                 
 Program ID:         1050                                                
 Link ID:            873034001                                           
 Interface:          eth0                                                
 Priority:           1000                                                
 Position:           0                                                   
 Proceed On:         pass, dispatcher_return                             
 Network Namespace:  None                                                
 Metadata:           bpfman.io/uuid=21f86d63-9bd6-41cb-b1ee-9340f4a16ab3 

[andreaskaris]

/assign