Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 842 insertions, 0 deletions

diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
new file mode 100644
index 000000000..8edac9307
--- /dev/null
+++ b/net/8021q/vlan_dev.c
@@ -0,0 +1,842 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* -*- linux-c -*-
+ * INET		802.1Q VLAN
+ *		Ethernet-type device handling.
+ *
+ * Authors:	Ben Greear <greearb@candelatech.com>
+ *              Please send support related email to: netdev@vger.kernel.org
+ *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
+ *
+ * Fixes:       Mar 22 2001: Martin Bokaemper <mbokaemper@unispherenetworks.com>
+ *                - reset skb->pkt_type on incoming packets when MAC was changed
+ *                - see that changed MAC is saddr for outgoing packets
+ *              Oct 20, 2001:  Ard van Breeman:
+ *                - Fix MC-list, finally.
+ *                - Flush MC-list on VLAN destroy.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/net_tstamp.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/phy.h>
+#include <net/arp.h>
+
+#include "vlan.h"
+#include "vlanproc.h"
+#include <linux/if_vlan.h>
+#include <linux/netpoll.h>
+
+/*
+ *	Create the VLAN header for an arbitrary protocol layer
+ *
+ *	saddr=NULL	means use device source address
+ *	daddr=NULL	means leave destination address (eg unresolved arp)
+ *
+ *  This is called when the SKB is moving down the stack towards the
+ *  physical devices.
+ */
+static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
+				unsigned short type,
+				const void *daddr, const void *saddr,
+				unsigned int len)
+{
+	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
+	struct vlan_hdr *vhdr;
+	unsigned int vhdrlen = 0;
+	u16 vlan_tci = 0;
+	int rc;
+
+	if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
+		vhdr = skb_push(skb, VLAN_HLEN);
+
+		vlan_tci = vlan->vlan_id;
+		vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
+		vhdr->h_vlan_TCI = htons(vlan_tci);
+
+		/*
+		 *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
+		 *  put the length in here instead.
+		 */
+		if (type != ETH_P_802_3 && type != ETH_P_802_2)
+			vhdr->h_vlan_encapsulated_proto = htons(type);
+		else
+			vhdr->h_vlan_encapsulated_proto = htons(len);
+
+		skb->protocol = vlan->vlan_proto;
+		type = ntohs(vlan->vlan_proto);
+		vhdrlen = VLAN_HLEN;
+	}
+
+	/* Before delegating work to the lower layer, enter our MAC-address */
+	if (saddr == NULL)
+		saddr = dev->dev_addr;
+
+	/* Now make the underlying real hard header */
+	dev = vlan->real_dev;
+	rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
+	if (rc > 0)
+		rc += vhdrlen;
+	return rc;
+}
+
+static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
+{
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	return netpoll_send_skb(vlan->netpoll, skb);
+#else
+	BUG();
+	return NETDEV_TX_OK;
+#endif
+}
+
+static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
+					    struct net_device *dev)
+{
+	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
+	struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
+	unsigned int len;
+	int ret;
+
+	/* Handle non-VLAN frames if they are sent to us, for example by DHCP.
+	 *
+	 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
+	 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
+	 */
+	if (vlan->flags & VLAN_FLAG_REORDER_HDR ||
+	    veth->h_vlan_proto != vlan->vlan_proto) {
+		u16 vlan_tci;
+		vlan_tci = vlan->vlan_id;
+		vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
+		__vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
+	}
+
+	skb->dev = vlan->real_dev;
+	len = skb->len;
+	if (unlikely(netpoll_tx_running(dev)))
+		return vlan_netpoll_send_skb(vlan, skb);
+
+	ret = dev_queue_xmit(skb);
+
+	if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
+		struct vlan_pcpu_stats *stats;
+
+		stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
+		u64_stats_update_begin(&stats->syncp);
+		stats->tx_packets++;
+		stats->tx_bytes += len;
+		u64_stats_update_end(&stats->syncp);
+	} else {
+		this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
+	}
+
+	return ret;
+}
+
+static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
+{
+	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
+	unsigned int max_mtu = real_dev->mtu;
+
+	if (netif_reduces_vlan_mtu(real_dev))
+		max_mtu -= VLAN_HLEN;
+	if (max_mtu < new_mtu)
+		return -ERANGE;
+
+	dev->mtu = new_mtu;
+
+	return 0;
+}
+
+void vlan_dev_set_ingress_priority(const struct net_device *dev,
+				   u32 skb_prio, u16 vlan_prio)
+{
+	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
+
+	if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
+		vlan->nr_ingress_mappings--;
+	else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
+		vlan->nr_ingress_mappings++;
+
+	vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
+}
+
+int vlan_dev_set_egress_priority(const struct net_device *dev,
+				 u32 skb_prio, u16 vlan_prio)
+{
+	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
+	struct vlan_priority_tci_mapping *mp = NULL;
+	struct vlan_priority_tci_mapping *np;
+	u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
+
+	/* See if a priority mapping exists.. */
+	mp = vlan->egress_priority_map[skb_prio & 0xF];
+	while (mp) {
+		if (mp->priority == skb_prio) {
+			if (mp->vlan_qos && !vlan_qos)
+				vlan->nr_egress_mappings--;
+			else if (!mp->vlan_qos && vlan_qos)
+				vlan->nr_egress_mappings++;
+			mp->vlan_qos = vlan_qos;
+			return 0;
+		}
+		mp = mp->next;
+	}
+
+	/* Create a new mapping then. */
+	mp = vlan->egress_priority_map[skb_prio & 0xF];
+	np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
+	if (!np)
+		return -ENOBUFS;
+
+	np->next = mp;
+	np->priority = skb_prio;
+	np->vlan_qos = vlan_qos;
+	/* Before inserting this element in hash table, make sure all its fields
+	 * are committed to memory.
+	 * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
+	 */
+	smp_wmb();
+	vlan->egress_priority_map[skb_prio & 0xF] = np;
+	if (vlan_qos)
+		vlan->nr_egress_mappings++;
+	return 0;
+}
+
+/* Flags are defined in the vlan_flags enum in
+ * include/uapi/linux/if_vlan.h file.
+ */
+int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
+{
+	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
+	u32 old_flags = vlan->flags;
+
+	if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
+		     VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP |
+		     VLAN_FLAG_BRIDGE_BINDING))
+		return -EINVAL;
+
+	vlan->flags = (old_flags & ~mask) | (flags & mask);
+
+	if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
+		if (vlan->flags & VLAN_FLAG_GVRP)
+			vlan_gvrp_request_join(dev);
+		else
+			vlan_gvrp_request_leave(dev);
+	}
+
+	if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
+		if (vlan->flags & VLAN_FLAG_MVRP)
+			vlan_mvrp_request_join(dev);
+		else
+			vlan_mvrp_request_leave(dev);
+	}
+	return 0;
+}
+
+void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
+{
+	strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
+}
+
+bool vlan_dev_inherit_address(struct net_device *dev,
+			      struct net_device *real_dev)
+{
+	if (dev->addr_assign_type != NET_ADDR_STOLEN)
+		return false;
+
+	ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
+	call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
+	return true;
+}
+
+static int vlan_dev_open(struct net_device *dev)
+{
+	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
+	struct net_device *real_dev = vlan->real_dev;
+	int err;
+
+	if (!(real_dev->flags & IFF_UP) &&
+	    !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
+		return -ENETDOWN;
+
+	if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) &&
+	    !vlan_dev_inherit_address(dev, real_dev)) {
+		err = dev_uc_add(real_dev, dev->dev_addr);
+		if (err < 0)
+			goto out;
+	}
+
+	if (dev->flags & IFF_ALLMULTI) {
+		err = dev_set_allmulti(real_dev, 1);
+		if (err < 0)
+			goto del_unicast;
+	}
+	if (dev->flags & IFF_PROMISC) {
+		err = dev_set_promiscuity(real_dev, 1);
+		if (err < 0)
+			goto clear_allmulti;
+	}
+
+	ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
+
+	if (vlan->flags & VLAN_FLAG_GVRP)
+		vlan_gvrp_request_join(dev);
+
+	if (vlan->flags & VLAN_FLAG_MVRP)
+		vlan_mvrp_request_join(dev);
+
+	if (netif_carrier_ok(real_dev) &&
+	    !(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
+		netif_carrier_on(dev);
+	return 0;
+
+clear_allmulti:
+	if (dev->flags & IFF_ALLMULTI)
+		dev_set_allmulti(real_dev, -1);
+del_unicast:
+	if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
+		dev_uc_del(real_dev, dev->dev_addr);
+out:
+	netif_carrier_off(dev);
+	return err;
+}
+
+static int vlan_dev_stop(struct net_device *dev)
+{
+	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
+	struct net_device *real_dev = vlan->real_dev;
+
+	dev_mc_unsync(real_dev, dev);
+	dev_uc_unsync(real_dev, dev);
+	if (dev->flags & IFF_ALLMULTI)
+		dev_set_allmulti(real_dev, -1);
+	if (dev->flags & IFF_PROMISC)
+		dev_set_promiscuity(real_dev, -1);
+
+	if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
+		dev_uc_del(real_dev, dev->dev_addr);
+
+	if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
+		netif_carrier_off(dev);
+	return 0;
+}
+
+static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
+{
+	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
+	struct sockaddr *addr = p;
+	int err;
+
+	if (!is_valid_ether_addr(addr->sa_data))
+		return -EADDRNOTAVAIL;
+
+	if (!(dev->flags & IFF_UP))
+		goto out;
+
+	if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
+		err = dev_uc_add(real_dev, addr->sa_data);
+		if (err < 0)
+			return err;
+	}
+
+	if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
+		dev_uc_del(real_dev, dev->dev_addr);
+
+out:
+	ether_addr_copy(dev->dev_addr, addr->sa_data);
+	return 0;
+}
+
+static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
+	const struct net_device_ops *ops = real_dev->netdev_ops;
+	struct ifreq ifrr;
+	int err = -EOPNOTSUPP;
+
+	strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
+	ifrr.ifr_ifru = ifr->ifr_ifru;
+
+	switch (cmd) {
+	case SIOCSHWTSTAMP:
+		if (!net_eq(dev_net(dev), dev_net(real_dev)))
+			break;
+		fallthrough;
+	case SIOCGMIIPHY:
+	case SIOCGMIIREG:
+	case SIOCSMIIREG:
+	case SIOCGHWTSTAMP:
+		if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
+			err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
+		break;
+	}
+
+	if (!err)
+		ifr->ifr_ifru = ifrr.ifr_ifru;
+
+	return err;
+}
+
+static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
+{
+	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
+	const struct net_device_ops *ops = real_dev->netdev_ops;
+	int err = 0;
+
+	if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
+		err = ops->ndo_neigh_setup(real_dev, pa);
+
+	return err;
+}
+
+#if IS_ENABLED(CONFIG_FCOE)
+static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
+				   struct scatterlist *sgl, unsigned int sgc)
+{
+	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
+	const struct net_device_ops *ops = real_dev->netdev_ops;
+	int rc = 0;
+
+	if (ops->ndo_fcoe_ddp_setup)
+		rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
+
+	return rc;
+}
+
+static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
+{
+	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
+	const struct net_device_ops *ops = real_dev->netdev_ops;
+	int len = 0;
+
+	if (ops->ndo_fcoe_ddp_done)
+		len = ops->ndo_fcoe_ddp_done(real_dev, xid);
+
+	return len;
+}
+
+static int vlan_dev_fcoe_enable(struct net_device *dev)
+{
+	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
+	const struct net_device_ops *ops = real_dev->netdev_ops;
+	int rc = -EINVAL;
+
+	if (ops->ndo_fcoe_enable)
+		rc = ops->ndo_fcoe_enable(real_dev);
+	return rc;
+}
+
+static int vlan_dev_fcoe_disable(struct net_device *dev)
+{
+	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
+	const struct net_device_ops *ops = real_dev->netdev_ops;
+	int rc = -EINVAL;
+
+	if (ops->ndo_fcoe_disable)
+		rc = ops->ndo_fcoe_disable(real_dev);
+	return rc;
+}
+
+static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
+				    struct scatterlist *sgl, unsigned int sgc)
+{
+	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
+	const struct net_device_ops *ops = real_dev->netdev_ops;
+	int rc = 0;
+
+	if (ops->ndo_fcoe_ddp_target)
+		rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
+
+	return rc;
+}
+#endif
+
+#ifdef NETDEV_FCOE_WWNN
+static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
+{
+	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
+	const struct net_device_ops *ops = real_dev->netdev_ops;
+	int rc = -EINVAL;
+
+	if (ops->ndo_fcoe_get_wwn)
+		rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
+	return rc;
+}
+#endif
+
+static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
+{
+	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
+
+	if (dev->flags & IFF_UP) {
+		if (change & IFF_ALLMULTI)
+			dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
+		if (change & IFF_PROMISC)
+			dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
+	}
+}
+
+static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
+{
+	dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
+	dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
+}
+
+/*
+ * vlan network devices have devices nesting below it, and are a special
+ * "super class" of normal network devices; split their locks off into a
+ * separate class since they always nest.
+ */
+static struct lock_class_key vlan_netdev_xmit_lock_key;
+static struct lock_class_key vlan_netdev_addr_lock_key;
+
+static void vlan_dev_set_lockdep_one(struct net_device *dev,
+				     struct netdev_queue *txq,
+				     void *unused)
+{
+	lockdep_set_class(&txq->_xmit_lock, &vlan_netdev_xmit_lock_key);
+}
+
+static void vlan_dev_set_lockdep_class(struct net_device *dev)
+{
+	lockdep_set_class(&dev->addr_list_lock,
+			  &vlan_netdev_addr_lock_key);
+	netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, NULL);
+}
+
+static const struct header_ops vlan_header_ops = {
+	.create	 = vlan_dev_hard_header,
+	.parse	 = eth_header_parse,
+};
+
+static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
+				     unsigned short type,
+				     const void *daddr, const void *saddr,
+				     unsigned int len)
+{
+	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
+	struct net_device *real_dev = vlan->real_dev;
+
+	if (saddr == NULL)
+		saddr = dev->dev_addr;
+
+	return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
+}
+
+static const struct header_ops vlan_passthru_header_ops = {
+	.create	 = vlan_passthru_hard_header,
+	.parse	 = eth_header_parse,
+};
+
+static struct device_type vlan_type = {
+	.name	= "vlan",
+};
+
+static const struct net_device_ops vlan_netdev_ops;
+
+static int vlan_dev_init(struct net_device *dev)
+{
+	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
+	struct net_device *real_dev = vlan->real_dev;
+
+	netif_carrier_off(dev);
+
+	/* IFF_BROADCAST|IFF_MULTICAST; ??? */
+	dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
+					  IFF_MASTER | IFF_SLAVE);
+	dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
+					  (1<<__LINK_STATE_DORMANT))) |
+		      (1<<__LINK_STATE_PRESENT);
+
+	if (vlan->flags & VLAN_FLAG_BRIDGE_BINDING)
+		dev->state |= (1 << __LINK_STATE_NOCARRIER);
+
+	dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
+			   NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
+			   NETIF_F_GSO_ENCAP_ALL |
+			   NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
+			   NETIF_F_ALL_FCOE;
+
+	dev->features |= dev->hw_features | NETIF_F_LLTX;
+	dev->gso_max_size = real_dev->gso_max_size;
+	dev->gso_max_segs = real_dev->gso_max_segs;
+	if (dev->features & NETIF_F_VLAN_FEATURES)
+		netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
+
+	dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE;
+	dev->hw_enc_features = vlan_tnl_features(real_dev);
+	dev->mpls_features = real_dev->mpls_features;
+
+	/* ipv6 shared card related stuff */
+	dev->dev_id = real_dev->dev_id;
+
+	if (is_zero_ether_addr(dev->dev_addr)) {
+		ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
+		dev->addr_assign_type = NET_ADDR_STOLEN;
+	}
+	if (is_zero_ether_addr(dev->broadcast))
+		memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
+
+#if IS_ENABLED(CONFIG_FCOE)
+	dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
+#endif
+
+	dev->needed_headroom = real_dev->needed_headroom;
+	if (vlan_hw_offload_capable(real_dev->features, vlan->vlan_proto)) {
+		dev->header_ops      = &vlan_passthru_header_ops;
+		dev->hard_header_len = real_dev->hard_header_len;
+	} else {
+		dev->header_ops      = &vlan_header_ops;
+		dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
+	}
+
+	dev->netdev_ops = &vlan_netdev_ops;
+
+	SET_NETDEV_DEVTYPE(dev, &vlan_type);
+
+	vlan_dev_set_lockdep_class(dev);
+
+	vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
+	if (!vlan->vlan_pcpu_stats)
+		return -ENOMEM;
+
+	/* Get vlan's reference to real_dev */
+	dev_hold(real_dev);
+
+	return 0;
+}
+
+/* Note: this function might be called multiple times for the same device. */
+void vlan_dev_uninit(struct net_device *dev)
+{
+	struct vlan_priority_tci_mapping *pm;
+	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
+		while ((pm = vlan->egress_priority_map[i]) != NULL) {
+			vlan->egress_priority_map[i] = pm->next;
+			kfree(pm);
+		}
+	}
+}
+
+static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
+	netdev_features_t features)
+{
+	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
+	netdev_features_t old_features = features;
+	netdev_features_t lower_features;
+
+	lower_features = netdev_intersect_features((real_dev->vlan_features |
+						    NETIF_F_RXCSUM),
+						   real_dev->features);
+
+	/* Add HW_CSUM setting to preserve user ability to control
+	 * checksum offload on the vlan device.
+	 */
+	if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
+		lower_features |= NETIF_F_HW_CSUM;
+	features = netdev_intersect_features(features, lower_features);
+	features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
+	features |= NETIF_F_LLTX;
+
+	return features;
+}
+
+static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
+					   struct ethtool_link_ksettings *cmd)
+{
+	const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
+
+	return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
+}
+
+static void vlan_ethtool_get_drvinfo(struct net_device *dev,
+				     struct ethtool_drvinfo *info)
+{
+	strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
+	strlcpy(info->version, vlan_version, sizeof(info->version));
+	strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
+}
+
+static int vlan_ethtool_get_ts_info(struct net_device *dev,
+				    struct ethtool_ts_info *info)
+{
+	const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
+	const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
+	struct phy_device *phydev = vlan->real_dev->phydev;
+
+	if (phy_has_tsinfo(phydev)) {
+		return phy_ts_info(phydev, info);
+	} else if (ops->get_ts_info) {
+		return ops->get_ts_info(vlan->real_dev, info);
+	} else {
+		info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
+			SOF_TIMESTAMPING_SOFTWARE;
+		info->phc_index = -1;
+	}
+
+	return 0;
+}
+
+static void vlan_dev_get_stats64(struct net_device *dev,
+				 struct rtnl_link_stats64 *stats)
+{
+	struct vlan_pcpu_stats *p;
+	u32 rx_errors = 0, tx_dropped = 0;
+	int i;
+
+	for_each_possible_cpu(i) {
+		u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
+		unsigned int start;
+
+		p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
+		do {
+			start = u64_stats_fetch_begin_irq(&p->syncp);
+			rxpackets	= p->rx_packets;
+			rxbytes		= p->rx_bytes;
+			rxmulticast	= p->rx_multicast;
+			txpackets	= p->tx_packets;
+			txbytes		= p->tx_bytes;
+		} while (u64_stats_fetch_retry_irq(&p->syncp, start));
+
+		stats->rx_packets	+= rxpackets;
+		stats->rx_bytes		+= rxbytes;
+		stats->multicast	+= rxmulticast;
+		stats->tx_packets	+= txpackets;
+		stats->tx_bytes		+= txbytes;
+		/* rx_errors & tx_dropped are u32 */
+		rx_errors	+= p->rx_errors;
+		tx_dropped	+= p->tx_dropped;
+	}
+	stats->rx_errors  = rx_errors;
+	stats->tx_dropped = tx_dropped;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void vlan_dev_poll_controller(struct net_device *dev)
+{
+	return;
+}
+
+static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
+{
+	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
+	struct net_device *real_dev = vlan->real_dev;
+	struct netpoll *netpoll;
+	int err = 0;
+
+	netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
+	err = -ENOMEM;
+	if (!netpoll)
+		goto out;
+
+	err = __netpoll_setup(netpoll, real_dev);
+	if (err) {
+		kfree(netpoll);
+		goto out;
+	}
+
+	vlan->netpoll = netpoll;
+
+out:
+	return err;
+}
+
+static void vlan_dev_netpoll_cleanup(struct net_device *dev)
+{
+	struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
+	struct netpoll *netpoll = vlan->netpoll;
+
+	if (!netpoll)
+		return;
+
+	vlan->netpoll = NULL;
+	__netpoll_free(netpoll);
+}
+#endif /* CONFIG_NET_POLL_CONTROLLER */
+
+static int vlan_dev_get_iflink(const struct net_device *dev)
+{
+	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
+
+	return real_dev->ifindex;
+}
+
+static const struct ethtool_ops vlan_ethtool_ops = {
+	.get_link_ksettings	= vlan_ethtool_get_link_ksettings,
+	.get_drvinfo	        = vlan_ethtool_get_drvinfo,
+	.get_link		= ethtool_op_get_link,
+	.get_ts_info		= vlan_ethtool_get_ts_info,
+};
+
+static const struct net_device_ops vlan_netdev_ops = {
+	.ndo_change_mtu		= vlan_dev_change_mtu,
+	.ndo_init		= vlan_dev_init,
+	.ndo_uninit		= vlan_dev_uninit,
+	.ndo_open		= vlan_dev_open,
+	.ndo_stop		= vlan_dev_stop,
+	.ndo_start_xmit =  vlan_dev_hard_start_xmit,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_set_mac_address	= vlan_dev_set_mac_address,
+	.ndo_set_rx_mode	= vlan_dev_set_rx_mode,
+	.ndo_change_rx_flags	= vlan_dev_change_rx_flags,
+	.ndo_do_ioctl		= vlan_dev_ioctl,
+	.ndo_neigh_setup	= vlan_dev_neigh_setup,
+	.ndo_get_stats64	= vlan_dev_get_stats64,
+#if IS_ENABLED(CONFIG_FCOE)
+	.ndo_fcoe_ddp_setup	= vlan_dev_fcoe_ddp_setup,
+	.ndo_fcoe_ddp_done	= vlan_dev_fcoe_ddp_done,
+	.ndo_fcoe_enable	= vlan_dev_fcoe_enable,
+	.ndo_fcoe_disable	= vlan_dev_fcoe_disable,
+	.ndo_fcoe_ddp_target	= vlan_dev_fcoe_ddp_target,
+#endif
+#ifdef NETDEV_FCOE_WWNN
+	.ndo_fcoe_get_wwn	= vlan_dev_fcoe_get_wwn,
+#endif
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller	= vlan_dev_poll_controller,
+	.ndo_netpoll_setup	= vlan_dev_netpoll_setup,
+	.ndo_netpoll_cleanup	= vlan_dev_netpoll_cleanup,
+#endif
+	.ndo_fix_features	= vlan_dev_fix_features,
+	.ndo_get_iflink		= vlan_dev_get_iflink,
+};
+
+static void vlan_dev_free(struct net_device *dev)
+{
+	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
+
+	free_percpu(vlan->vlan_pcpu_stats);
+	vlan->vlan_pcpu_stats = NULL;
+
+	/* Get rid of the vlan's reference to real_dev */
+	dev_put(vlan->real_dev);
+}
+
+void vlan_setup(struct net_device *dev)
+{
+	ether_setup(dev);
+
+	dev->priv_flags		|= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
+	dev->priv_flags		|= IFF_UNICAST_FLT;
+	dev->priv_flags		&= ~IFF_TX_SKB_SHARING;
+	netif_keep_dst(dev);
+
+	dev->netdev_ops		= &vlan_netdev_ops;
+	dev->needs_free_netdev	= true;
+	dev->priv_destructor	= vlan_dev_free;
+	dev->ethtool_ops	= &vlan_ethtool_ops;
+
+	dev->min_mtu		= 0;
+	dev->max_mtu		= ETH_MAX_MTU;
+
+	eth_zero_addr(dev->broadcast);
+}