Propagate CSI node accessible topology

[toughlex-donatas]

Summary

Propagate accessible_topology returned by the CSI NodeGetInfo RPC into SwarmKit's NodeCSIInfo.

Add a regression test covering the conversion.

Problem

makeNodeInfo currently copies only:

• node_id
• max_volumes_per_node

Although both the CSI NodeGetInfoResponse and SwarmKit's NodeCSIInfo contain an accessible topology field, that topology is discarded during conversion.

As a result, Swarm nodes are registered without CSI topology information. The scheduler cannot match topology-constrained cluster volumes to nodes and reports:

no suitable node (cannot fulfill requested CSI volume mounts on 3 nodes)

Reproduction

Environment:

Docker Engine: 29.6.2
API version: 1.55

Calling NodeGetInfo directly returns the expected topology:

node ID: i-...
max volumes: 26
topology:
  topology.ebs.csi.aws.com/zone: eu-central-1a
  topology.kubernetes.io/zone: eu-central-1a
  kubernetes.io/os: linux

However, the Swarm node description omits it:

{
  "PluginName": "csi-aws-ebs:latest",
  "NodeID": "i-...",
  "MaxVolumesPerNode": 26
}

Fix

Convert the CSI topology into SwarmKit's api.Topology when processing the NodeGetInfoResponse.

The topology remains nil when the CSI plugin does not return one.

Testing

go test ./agent/csi/plugin