i40e: Implement ndo_features_check()

i40e supports UDP tunnel headers up to 80 bytes in length, so
this adds a check to ensure that it doesn't try to offload
packets that exceed that.

Signed-off-by: Joe Stringer <joestringer@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
Acked-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 48a52b3..b44eb35 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -8099,6 +8099,25 @@ static int i40e_ndo_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 }
 #endif /* HAVE_BRIDGE_ATTRIBS */
 
+#define I40E_MAX_TUNNEL_HDR_LEN 80
+/**
+ * i40e_features_check - Validate encapsulated packet conforms to limits
+ * @skb: skb buff
+ * @netdev: This physical port's netdev
+ * @features: Offload features that the stack believes apply
+ **/
+static netdev_features_t i40e_features_check(struct sk_buff *skb,
+                                            struct net_device *dev,
+                                            netdev_features_t features)
+{
+       if (skb->encapsulation &&
+           (skb_inner_mac_header(skb) - skb_transport_header(skb) >
+            I40E_MAX_TUNNEL_HDR_LEN))
+               return features & ~(NETIF_F_ALL_CSUM | NETIF_F_GSO_MASK);
+
+       return features;
+}
+
 static const struct net_device_ops i40e_netdev_ops = {
        .ndo_open               = i40e_open,
        .ndo_stop               = i40e_close,
@@ -8133,6 +8152,7 @@ static const struct net_device_ops i40e_netdev_ops = {
 #endif
        .ndo_get_phys_port_id   = i40e_get_phys_port_id,
        .ndo_fdb_add            = i40e_ndo_fdb_add,
+       .ndo_features_check     = i40e_features_check,
 #ifdef HAVE_BRIDGE_ATTRIBS
        .ndo_bridge_getlink     = i40e_ndo_bridge_getlink,
        .ndo_bridge_setlink     = i40e_ndo_bridge_setlink,