+unsigned long netdev_fix_features(unsigned long features, const char *name)
+{
+ /* Fix illegal SG+CSUM combinations. */
+ if ((features & NETIF_F_SG) &&
+ !(features & NETIF_F_ALL_CSUM)) {
+ if (name)
+ printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
+ "checksum feature.\n", name);
+ features &= ~NETIF_F_SG;
+ }
+
+ /* TSO requires that SG is present as well. */
+ if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
+ if (name)
+ printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
+ "SG feature.\n", name);
+ features &= ~NETIF_F_TSO;
+ }
+
+ if (features & NETIF_F_UFO) {
+ if (!(features & NETIF_F_GEN_CSUM)) {
+ if (name)
+ printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
+ "since no NETIF_F_HW_CSUM feature.\n",
+ name);
+ features &= ~NETIF_F_UFO;
+ }
+
+ if (!(features & NETIF_F_SG)) {
+ if (name)
+ printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
+ "since no NETIF_F_SG feature.\n", name);
+ features &= ~NETIF_F_UFO;
+ }
+ }
+
+ return features;
+}
+EXPORT_SYMBOL(netdev_fix_features);
+