From: Paolo Abeni <pabeni@redhat.com>
Date: Tue, 6 Mar 2018 10:56:31 +0100
Subject: net: unpollute priv_flags space
Patch-mainline: v4.17-rc1
Git-commit: 1ec54cb44e6731c3cb251bcf9251d65a4b4f6306
References: bsc#1109837

the ipvlan device driver defines and uses 2 bits inside the priv_flags
net_device field. Such bits and the related helper are used only
inside the ipvlan device driver, and the core networking does not
need to be aware of them.

This change moves netif_is_ipvlan* helper in the ipvlan driver and
re-implement them looking for ipvlan specific symbols instead of
using priv_flags.

Overall this frees two bits inside priv_flags - and move the following
ones to avoid gaps - without any intended functional change.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ipvlan/ipvlan.h      |    6 ++++++
 drivers/net/ipvlan/ipvlan_main.c |   10 ++++++----
 include/linux/netdevice.h        |   32 ++++++++------------------------
 3 files changed, 20 insertions(+), 28 deletions(-)

--- a/drivers/net/ipvlan/ipvlan.h
+++ b/drivers/net/ipvlan/ipvlan.h
@@ -145,4 +145,10 @@ int ipvlan_link_new(struct net *src_net,
 void ipvlan_link_delete(struct net_device *dev, struct list_head *head);
 void ipvlan_link_setup(struct net_device *dev);
 int ipvlan_link_register(struct rtnl_link_ops *ops);
+
+static inline bool netif_is_ipvlan_port(const struct net_device *dev)
+{
+	return dev->rx_handler == ipvlan_handle_frame;
+}
+
 #endif /* __IPVLAN_H */
--- a/drivers/net/ipvlan/ipvlan_main.c
+++ b/drivers/net/ipvlan/ipvlan_main.c
@@ -127,7 +127,6 @@ static int ipvlan_port_create(struct net
 	if (err)
 		goto err;
 
-	dev->priv_flags |= IFF_IPVLAN_MASTER;
 	return 0;
 
 err:
@@ -140,7 +139,6 @@ static void ipvlan_port_destroy(struct n
 	struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
 	struct sk_buff *skb;
 
-	dev->priv_flags &= ~IFF_IPVLAN_MASTER;
 	if (port->mode == IPVLAN_MODE_L3S) {
 		dev->priv_flags &= ~IFF_L3MDEV_MASTER;
 		ipvlan_unregister_nf_hook(dev_net(dev));
@@ -417,6 +415,12 @@ static const struct header_ops ipvlan_he
 	.cache_update	= eth_header_cache_update,
 };
 
+static bool netif_is_ipvlan(const struct net_device *dev)
+{
+	/* both ipvlan and ipvtap devices use the same netdev_ops */
+	return dev->netdev_ops == &ipvlan_netdev_ops;
+}
+
 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev,
 					     struct ethtool_link_ksettings *cmd)
 {
@@ -557,8 +561,6 @@ int ipvlan_link_new(struct net *src_net,
 	 */
 	memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
 
-	dev->priv_flags |= IFF_IPVLAN_SLAVE;
-
 	err = register_netdevice(dev);
 	if (err < 0)
 		return err;
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1376,8 +1376,6 @@ struct net_device_ops {
  * @IFF_MACVLAN: Macvlan device
  * @IFF_XMIT_DST_RELEASE_PERM: IFF_XMIT_DST_RELEASE not taking into account
  *	underlying stacked devices
- * @IFF_IPVLAN_MASTER: IPvlan master device
- * @IFF_IPVLAN_SLAVE: IPvlan slave device
  * @IFF_L3MDEV_MASTER: device is an L3 master device
  * @IFF_NO_QUEUE: device can run without qdisc attached
  * @IFF_OPENVSWITCH: device is a Open vSwitch master
@@ -1407,16 +1405,14 @@ enum netdev_priv_flags {
 	IFF_LIVE_ADDR_CHANGE		= 1<<15,
 	IFF_MACVLAN			= 1<<16,
 	IFF_XMIT_DST_RELEASE_PERM	= 1<<17,
-	IFF_IPVLAN_MASTER		= 1<<18,
-	IFF_IPVLAN_SLAVE		= 1<<19,
-	IFF_L3MDEV_MASTER		= 1<<20,
-	IFF_NO_QUEUE			= 1<<21,
-	IFF_OPENVSWITCH			= 1<<22,
-	IFF_L3MDEV_SLAVE		= 1<<23,
-	IFF_TEAM			= 1<<24,
-	IFF_RXFH_CONFIGURED		= 1<<25,
-	IFF_PHONY_HEADROOM		= 1<<26,
-	IFF_MACSEC			= 1<<27,
+	IFF_L3MDEV_MASTER		= 1<<18,
+	IFF_NO_QUEUE			= 1<<19,
+	IFF_OPENVSWITCH			= 1<<20,
+	IFF_L3MDEV_SLAVE		= 1<<21,
+	IFF_TEAM			= 1<<22,
+	IFF_RXFH_CONFIGURED		= 1<<23,
+	IFF_PHONY_HEADROOM		= 1<<24,
+	IFF_MACSEC			= 1<<25,
 };
 
 #define IFF_802_1Q_VLAN			IFF_802_1Q_VLAN
@@ -1437,8 +1433,6 @@ enum netdev_priv_flags {
 #define IFF_LIVE_ADDR_CHANGE		IFF_LIVE_ADDR_CHANGE
 #define IFF_MACVLAN			IFF_MACVLAN
 #define IFF_XMIT_DST_RELEASE_PERM	IFF_XMIT_DST_RELEASE_PERM
-#define IFF_IPVLAN_MASTER		IFF_IPVLAN_MASTER
-#define IFF_IPVLAN_SLAVE		IFF_IPVLAN_SLAVE
 #define IFF_L3MDEV_MASTER		IFF_L3MDEV_MASTER
 #define IFF_NO_QUEUE			IFF_NO_QUEUE
 #define IFF_OPENVSWITCH			IFF_OPENVSWITCH
@@ -4205,16 +4199,6 @@ static inline bool netif_is_macvlan_port
 	return dev->priv_flags & IFF_MACVLAN_PORT;
 }
 
-static inline bool netif_is_ipvlan(const struct net_device *dev)
-{
-	return dev->priv_flags & IFF_IPVLAN_SLAVE;
-}
-
-static inline bool netif_is_ipvlan_port(const struct net_device *dev)
-{
-	return dev->priv_flags & IFF_IPVLAN_MASTER;
-}
-
 static inline bool netif_is_bond_master(const struct net_device *dev)
 {
 	return dev->flags & IFF_MASTER && dev->priv_flags & IFF_BONDING;