0, 0, nlflags, filter_mask, NULL);
}
-/* Hardware supports L4 tunnel length of 128B (=2^7) which includes
- * inner mac plus all inner ethertypes.
- */
-#define I40E_MAX_TUNNEL_HDR_LEN 128
/**
* i40e_features_check - Validate encapsulated packet conforms to limits
* @skb: skb buff
struct net_device *dev,
netdev_features_t features)
{
- if (skb->encapsulation &&
- ((skb_inner_network_header(skb) - skb_transport_header(skb)) >
- I40E_MAX_TUNNEL_HDR_LEN))
- return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
+ size_t len;
+
+ /* No point in doing any of this if neither checksum nor GSO are
+ * being requested for this frame. We can rule out both by just
+ * checking for CHECKSUM_PARTIAL
+ */
+ if (skb->ip_summed != CHECKSUM_PARTIAL)
+ return features;
+
+ /* We cannot support GSO if the MSS is going to be less than
+ * 64 bytes. If it is then we need to drop support for GSO.
+ */
+ if (skb_is_gso(skb) && (skb_shinfo(skb)->gso_size < 64))
+ features &= ~NETIF_F_GSO_MASK;
+
+ /* MACLEN can support at most 63 words */
+ len = skb_network_header(skb) - skb->data;
+ if (len & ~(63 * 2))
+ goto out_err;
+
+ /* IPLEN and EIPLEN can support at most 127 dwords */
+ len = skb_transport_header(skb) - skb_network_header(skb);
+ if (len & ~(127 * 4))
+ goto out_err;
+
+ if (skb->encapsulation) {
+ /* L4TUNLEN can support 127 words */
+ len = skb_inner_network_header(skb) - skb_transport_header(skb);
+ if (len & ~(127 * 2))
+ goto out_err;
+
+ /* IPLEN can support at most 127 dwords */
+ len = skb_inner_transport_header(skb) -
+ skb_inner_network_header(skb);
+ if (len & ~(127 * 4))
+ goto out_err;
+ }
+
+ /* No need to validate L4LEN as TCP is the only protocol with a
+ * a flexible value and we support all possible values supported
+ * by TCP, which is at most 15 dwords
+ */
return features;
+out_err:
+ return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
}
static const struct net_device_ops i40e_netdev_ops = {