Add support to manage the vlan protocol on a vf

This allows users to get and set the vlan protocol on a vf
Signed-off-by: Marcelo Guerrero <marguerr@redhat.com>

handle_unspecified.go

@@ -79,6 +79,10 @@ func (h *Handle) LinkSetVfVlanQos(link Link, vf, vlan, qos int) error {
 	return ErrNotImplemented
 }
 
+func (h *Handle) LinkSetVfVlanQosProto(link Link, vf, vlan, qos, proto int) error {
+	return ErrNotImplemented
+}
+
 func (h *Handle) LinkSetVfTxRate(link Link, vf, rate int) error {
 	return ErrNotImplemented
 }

link.go

@@ -68,6 +68,7 @@ type VfInfo struct {
 	Mac       net.HardwareAddr
 	Vlan      int
 	Qos       int
+	VlanProto int
 	TxRate    int // IFLA_VF_TX_RATE  Max TxRate
 	Spoofchk  bool
 	LinkState uint32

link_linux.go

@@ -612,6 +612,43 @@ func (h *Handle) LinkSetVfVlanQos(link Link, vf, vlan, qos int) error {
 	return err
 }
 
+// LinkSetVfVlanQosProto sets the vlan, qos and protocol of a vf for the link.
+// Equivalent to: `ip link set $link vf $vf vlan $vlan qos $qos proto $proto`
+func LinkSetVfVlanQosProto(link Link, vf, vlan, qos, proto int) error {
+	return pkgHandle.LinkSetVfVlanQosProto(link, vf, vlan, qos, proto)
+}
+
+// LinkSetVfVlanQosProto sets the vlan, qos and protocol of a vf for the link.
+// Equivalent to: `ip link set $link vf $vf vlan $vlan qos $qos proto $proto`
+func (h *Handle) LinkSetVfVlanQosProto(link Link, vf, vlan, qos, proto int) error {
+	base := link.Attrs()
+	h.ensureIndex(base)
+	req := h.newNetlinkRequest(unix.RTM_SETLINK, unix.NLM_F_ACK)
+
+	msg := nl.NewIfInfomsg(unix.AF_UNSPEC)
+	msg.Index = int32(base.Index)
+	req.AddData(msg)
+
+	data := nl.NewRtAttr(unix.IFLA_VFINFO_LIST, nil)
+	vfInfo := data.AddRtAttr(nl.IFLA_VF_INFO, nil)
+	vfVlanList := vfInfo.AddRtAttr(nl.IFLA_VF_VLAN_LIST, nil)
+
+	vfmsg := nl.VfVlanInfo{
+		VfVlan: nl.VfVlan{
+			Vf:   uint32(vf),
+			Vlan: uint32(vlan),
+			Qos:  uint32(qos),
+		},
+		VlanProto: (uint16(proto)>>8)&0xFF | (uint16(proto)&0xFF)<<8,
+	}
+
+	vfVlanList.AddRtAttr(nl.IFLA_VF_VLAN_INFO, vfmsg.Serialize())
+	req.AddData(data)
+
+	_, err := req.Execute(unix.NETLINK_ROUTE, 0)
+	return err
+}
+
 // LinkSetVfTxRate sets the tx rate of a vf for the link.
 // Equivalent to: `ip link set $link vf $vf rate $rate`
 func LinkSetVfTxRate(link Link, vf, rate int) error {
@@ -3371,12 +3408,17 @@ func parseVfInfoList(data []syscall.NetlinkRouteAttr) ([]VfInfo, error) {
 		if err != nil {
 			return nil, err
 		}
-		vfs = append(vfs, parseVfInfo(vfAttrs, i))
+
+		vf, err := parseVfInfo(vfAttrs, i)
+		if err != nil {
+			return nil, err
+		}
+		vfs = append(vfs, vf)
 	}
 	return vfs, nil
 }
 
-func parseVfInfo(data []syscall.NetlinkRouteAttr, id int) VfInfo {
+func parseVfInfo(data []syscall.NetlinkRouteAttr, id int) (VfInfo, error) {
 	vf := VfInfo{ID: id}
 	for _, element := range data {
 		switch element.Attr.Type {
@@ -3387,6 +3429,12 @@ func parseVfInfo(data []syscall.NetlinkRouteAttr, id int) VfInfo {
 			vl := nl.DeserializeVfVlan(element.Value[:])
 			vf.Vlan = int(vl.Vlan)
 			vf.Qos = int(vl.Qos)
+		case nl.IFLA_VF_VLAN_LIST:
+			vfVlanInfoList, err := nl.DeserializeVfVlanList(element.Value[:])
+			if err != nil {
+				return vf, err
+			}
+			vf.VlanProto = int(vfVlanInfoList[0].VlanProto)
 		case nl.IFLA_VF_TX_RATE:
 			txr := nl.DeserializeVfTxRate(element.Value[:])
 			vf.TxRate = int(txr.Rate)
@@ -3420,7 +3468,7 @@ func parseVfInfo(data []syscall.NetlinkRouteAttr, id int) VfInfo {
 			vf.Trust = result.Setting
 		}
 	}
-	return vf
+	return vf, nil
 }
 
 func addXfrmiAttrs(xfrmi *Xfrmi, linkInfo *nl.RtAttr) {

netlink_unspecified.go

@@ -52,6 +52,10 @@ func LinkSetVfVlanQos(link Link, vf, vlan, qos int) error {
 	return ErrNotImplemented
 }
 
+func LinkSetVfVlanQosProto(link Link, vf, vlan, qos, proto int) error {
+	return ErrNotImplemented
+}
+
 func LinkSetVfTxRate(link Link, vf, rate int) error {
 	return ErrNotImplemented
 }

nl/link_linux.go

@@ -3,6 +3,7 @@ package nl
 import (
 	"bytes"
 	"encoding/binary"
+	"fmt"
 	"unsafe"
 )
 
@@ -274,9 +275,17 @@ const (
 	IFLA_VF_TRUST        /* Trust state of VF */
 	IFLA_VF_IB_NODE_GUID /* VF Infiniband node GUID */
 	IFLA_VF_IB_PORT_GUID /* VF Infiniband port GUID */
+	IFLA_VF_VLAN_LIST    /* nested list of vlans, option for QinQ */
+
 	IFLA_VF_MAX = IFLA_VF_IB_PORT_GUID
 )
 
+const (
+	IFLA_VF_VLAN_INFO_UNSPEC = iota
+	IFLA_VF_VLAN_INFO        /* VLAN ID, QoS and VLAN protocol */
+	__IFLA_VF_VLAN_INFO_MAX
+)
+
 const (
 	IFLA_VF_LINK_STATE_AUTO    = iota /* link state of the uplink */
 	IFLA_VF_LINK_STATE_ENABLE         /* link always up */
@@ -299,6 +308,7 @@ const (
 const (
 	SizeofVfMac        = 0x24
 	SizeofVfVlan       = 0x0c
+	SizeofVfVlanInfo   = 0x0e
 	SizeofVfTxRate     = 0x08
 	SizeofVfRate       = 0x0c
 	SizeofVfSpoofchk   = 0x08
@@ -354,6 +364,49 @@ func (msg *VfVlan) Serialize() []byte {
 	return (*(*[SizeofVfVlan]byte)(unsafe.Pointer(msg)))[:]
 }
 
+func DeserializeVfVlanList(b []byte) ([]*VfVlanInfo, error) {
+	var vfVlanInfoList []*VfVlanInfo
+	attrs, err := ParseRouteAttr(b)
+	if err != nil {
+		return nil, err
+	}
+
+	for _, element := range attrs {
+		if element.Attr.Type == IFLA_VF_VLAN_INFO {
+			vfVlanInfoList = append(vfVlanInfoList, DeserializeVfVlanInfo(element.Value))
+		}
+	}
+
+	if len(vfVlanInfoList) == 0 {
+		return nil, fmt.Errorf("VF vlan list is defined but no vf vlan info elements were found")
+	}
+
+	return vfVlanInfoList, nil
+}
+
+// struct ifla_vf_vlan_info {
+//   __u32 vf;
+//   __u32 vlan; /* 0 - 4095, 0 disables VLAN filter */
+//   __u32 qos;
+//   __be16 vlan_proto; /* VLAN protocol either 802.1Q or 802.1ad */
+// };
+
+type VfVlanInfo struct {
+	VfVlan
+	VlanProto uint16
+}
+
+func DeserializeVfVlanInfo(b []byte) *VfVlanInfo {
+	return &VfVlanInfo{
+		*(*VfVlan)(unsafe.Pointer(&b[0:SizeofVfVlan][0])),
+		binary.BigEndian.Uint16(b[SizeofVfVlan:SizeofVfVlanInfo]),
+	}
+}
+
+func (msg *VfVlanInfo) Serialize() []byte {
+	return (*(*[SizeofVfVlanInfo]byte)(unsafe.Pointer(msg)))[:]
+}
+
 // struct ifla_vf_tx_rate {
 //   __u32 vf;
 //   __u32 rate; /* Max TX bandwidth in Mbps, 0 disables throttling */