Fix checks for vlan parameters

Add back check when vlan is zero and qos is not zero.
Remove check when vlan is zero and qos and proto are not in
config since default values are now set.

Signed-off-by: Marcelo Guerrero <marguerr@redhat.com>

pkg/config/config.go

@@ -79,10 +79,6 @@ func LoadConf(bytes []byte) (*sriovtypes.NetConf, error) {
 		return nil, fmt.Errorf("LoadConf(): vlan id %d invalid: value must be in the range 0-4094", *n.Vlan)
 	}
 
-	if *n.Vlan == 0 && (n.VlanQoS != nil || n.VlanProto != nil) {
-		return nil, fmt.Errorf("LoadConf(): non-zero vlan id must be configured to set vlan Qos and/or Proto")
-	}
-
 	if n.VlanQoS == nil {
 		qos := 0
 		n.VlanQoS = &qos
@@ -93,6 +89,11 @@ func LoadConf(bytes []byte) (*sriovtypes.NetConf, error) {
 		return nil, fmt.Errorf("LoadConf(): vlan QoS PCP %d invalid: value must be in the range 0-7", *n.VlanQoS)
 	}
 
+	// validate non-zero value for vlan id if vlan qos is set to a non-zero value
+	if *n.VlanQoS != 0 && *n.Vlan == 0 {
+		return nil, fmt.Errorf("LoadConf(): non-zero vlan id must be configured to set vlan QoS to a non-zero value")
+	}
+
 	if n.VlanProto == nil {
 		proto := sriovtypes.Proto8021q
 		n.VlanProto = &proto

pkg/config/config_test.go

@@ -109,13 +109,11 @@ var _ = Describe("Config", func() {
 			Entry("valid vlan ID", &validVlanID, nil, nil, false),
 			Entry("invalid vlan ID", &invalidVlanID, nil, nil, true),
 			Entry("vlan ID equal to zero and QoS set", &zeroVlanID, &validQoS, nil, true),
-			Entry("vlan ID equal to zero and Proto set", &zeroVlanID, nil, &valid8021qProto, true),
 			Entry("invalid QoS", &validVlanID, &invalidQoS, nil, true),
 			Entry("invalid Proto", &validVlanID, nil, &invalidProto, true),
 			Entry("valid 802.1q Proto", &validVlanID, nil, &valid8021qProto, false),
 			Entry("valid 802.1ad Proto", &validVlanID, nil, &valid8021adProto, false),
 			Entry("no vlan ID and QoS set", nil, &validQoS, nil, true),
-			Entry("no vlan ID and Proto set", nil, nil, &valid8021adProto, true),
 		)
 
 		It("Assuming device is allocated", func() {