macvlan cmdDel: replace the loadConf function with json.unmarshal

We call the loadConf function in cmDel just for ipam, So we just replace loadConf with json.unmarshal, which would be simpler. This also fixes the issue that when the pod's NIC is accidentally deleted, we should return nil to the runtime instead of LinkNotFound error.

Signed-off-by: cyclinder <qifeng.guo@daocloud.io>

plugins/main/macvlan/macvlan.go

@@ -382,13 +382,13 @@ func cmdAdd(args *skel.CmdArgs) error {
 }
 
 func cmdDel(args *skel.CmdArgs) error {
-	n, _, err := loadConf(args, args.Args)
+	var n NetConf
+	err := json.Unmarshal(args.StdinData, &n)
 	if err != nil {
-		return err
+		return fmt.Errorf("failed to load netConf: %v", err)
 	}
 
 	isLayer3 := n.IPAM.Type != ""
-
 	if isLayer3 {
 		err = ipam.ExecDel(n.IPAM.Type, args.StdinData)
 		if err != nil {