net: fall back to software segmentation if skb length exceeds dev->gso_max_size

Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index ffc3106..edd1e2b 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1943,7 +1943,8 @@ static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
 {
 	return skb_is_gso(skb) &&
 	       (!skb_gso_ok(skb, dev->features) ||
-		unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
+		unlikely(skb->ip_summed != CHECKSUM_PARTIAL) ||
+		unlikely(skb->len > dev->gso_max_size));
 }
 
 static inline void netif_set_gso_max_size(struct net_device *dev,