net: Disable LRO on devices that are forwarding

[linux-2.6-omap-h63xx.git] / net / core / dev.c

diff --git a/net/core/dev.c b/net/core/dev.c
index a495f712d38ce4683b2a77cde1b55156ac3b619f..f6944ecd5b2ec000e28e6ac5c558706918d05afd 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -90,6 +90,7 @@
 #include <linux/if_ether.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
+#include <linux/ethtool.h>
 #include <linux/notifier.h>
 #include <linux/skbuff.h>
 #include <net/net_namespace.h>
@@ -1123,6 +1124,29 @@ int dev_close(struct net_device *dev)
 }
 
 
+/**
+ *     dev_disable_lro - disable Large Receive Offload on a device
+ *     @dev: device
+ *
+ *     Disable Large Receive Offload (LRO) on a net device.  Must be
+ *     called under RTNL.  This is needed if received packets may be
+ *     forwarded to another interface.
+ */
+void dev_disable_lro(struct net_device *dev)
+{
+       if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
+           dev->ethtool_ops->set_flags) {
+               u32 flags = dev->ethtool_ops->get_flags(dev);
+               if (flags & ETH_FLAG_LRO) {
+                       flags &= ~ETH_FLAG_LRO;
+                       dev->ethtool_ops->set_flags(dev, flags);
+               }
+       }
+       WARN_ON(dev->features & NETIF_F_LRO);
+}
+EXPORT_SYMBOL(dev_disable_lro);
+
+
 static int dev_boot_phase = 1;
 
 /*