net: generic dev_disable_lro() stacked device handling

Large receive offloading is known to cause problems if received packets
are passed to other host. Therefore the kernel disables it by calling
dev_disable_lro() whenever a network device is enslaved in a bridge or
forwarding is enabled for it (or globally). For virtual devices we need
to disable LRO on the underlying physical device (which is actually
receiving the packets).

Current dev_disable_lro() code handles this  propagation for a vlan
(including 802.1ad nested vlan), macvlan or a vlan on top of a macvlan.
It doesn't handle other stacked devices and their combinations, in
particular propagation from a bond to its slaves which often causes
problems in virtualization setups.

As we now have generic data structures describing the upper-lower device
relationship, dev_disable_lro() can be generalized to disable LRO also
for all lower devices (if any) once it is disabled for the device
itself.

For bonding and teaming devices, it is necessary to disable LRO not only
on current slaves at the moment when dev_disable_lro() is called but
also on any slave (port) added later.

v2: use lower device links for all devices (including vlan and macvlan)

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Acked-by: Veaceslav Falico <vfalico@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 10 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index bb09b036461..1ab168e0fdf 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1437,22 +1437,17 @@ EXPORT_SYMBOL(dev_close);
  */
 void dev_disable_lro(struct net_device *dev)
 {
-	/*
-	 * If we're trying to disable lro on a vlan device
-	 * use the underlying physical device instead
-	 */
-	if (is_vlan_dev(dev))
-		dev = vlan_dev_real_dev(dev);
-
-	/* the same for macvlan devices */
-	if (netif_is_macvlan(dev))
-		dev = macvlan_dev_real_dev(dev);
+	struct net_device *lower_dev;
+	struct list_head *iter;
 
 	dev->wanted_features &= ~NETIF_F_LRO;
 	netdev_update_features(dev);
 
 	if (unlikely(dev->features & NETIF_F_LRO))
 		netdev_WARN(dev, "failed to disable LRO!\n");
+
+	netdev_for_each_lower_dev(dev, lower_dev, iter)
+		dev_disable_lro(lower_dev);
 }
 EXPORT_SYMBOL(dev_disable_lro);