vxlan: changelink: Postpone vxlan_config_apply()

When an FDB entry is vetoed, it is necessary to unroll the changes that
have already been done. To avoid having to unroll vxlan_config_apply(),
postpone the call after the point where the vetoing takes place. Since
the call can't fail, it doesn't necessitate any cleanups in the
preceding FDB update logic.

Correspondingly, move down the mod_timer() call as well.

References to *dst need to be replaced with references to conf.
Additionally, old_dst and old_age_interval are not necessary anymore,
and therefore drop them.
Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/vxlan.c

@@ -3792,9 +3792,7 @@ static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
 {
 	struct vxlan_dev *vxlan = netdev_priv(dev);
 	struct vxlan_rdst *dst = &vxlan->default_dst;
-	unsigned long old_age_interval;
 	struct net_device *lowerdev;
-	struct vxlan_rdst old_dst;
 	struct vxlan_config conf;
 	int err;
 
@@ -3803,40 +3801,31 @@ static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
 	if (err)
 		return err;
 
-	old_age_interval = vxlan->cfg.age_interval;
-	memcpy(&old_dst, dst, sizeof(struct vxlan_rdst));
-
 	err = vxlan_config_validate(vxlan->net, &conf, &lowerdev,
 				    vxlan, extack);
 	if (err)
 		return err;
 
-	vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
-
-	if (old_age_interval != vxlan->cfg.age_interval)
-		mod_timer(&vxlan->age_timer, jiffies);
-
 	/* handle default dst entry */
-	if (!vxlan_addr_equal(&dst->remote_ip, &old_dst.remote_ip)) {
+	if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) {
 		spin_lock_bh(&vxlan->hash_lock);
-		if (!vxlan_addr_any(&old_dst.remote_ip))
+		if (!vxlan_addr_any(&dst->remote_ip))
 			__vxlan_fdb_delete(vxlan, all_zeros_mac,
-					   old_dst.remote_ip,
+					   dst->remote_ip,
 					   vxlan->cfg.dst_port,
-					   old_dst.remote_vni,
-					   old_dst.remote_vni,
-					   old_dst.remote_ifindex,
+					   dst->remote_vni,
+					   dst->remote_vni,
+					   dst->remote_ifindex,
 					   true);
 
-		if (!vxlan_addr_any(&dst->remote_ip)) {
+		if (!vxlan_addr_any(&conf.remote_ip)) {
 			err = vxlan_fdb_update(vxlan, all_zeros_mac,
-					       &dst->remote_ip,
+					       &conf.remote_ip,
 					       NUD_REACHABLE | NUD_PERMANENT,
 					       NLM_F_APPEND | NLM_F_CREATE,
 					       vxlan->cfg.dst_port,
-					       dst->remote_vni,
-					       dst->remote_vni,
-					       dst->remote_ifindex,
+					       conf.vni, conf.vni,
+					       conf.remote_ifindex,
 					       NTF_SELF, true);
 			if (err) {
 				spin_unlock_bh(&vxlan->hash_lock);
@@ -3846,6 +3835,10 @@ static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
 		spin_unlock_bh(&vxlan->hash_lock);
 	}
 
+	if (conf.age_interval != vxlan->cfg.age_interval)
+		mod_timer(&vxlan->age_timer, jiffies);
+
+	vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
 	return 0;
 }