sfc: Enable heuristic selection between page and skb RX buffers

Now that we can tell whether GRO is being applied, this heuristic is
effective once more.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/sfc/rx.c

@@ -61,7 +61,7 @@
  *   rx_alloc_method = (rx_alloc_level > RX_ALLOC_LEVEL_LRO ?
  *                      RX_ALLOC_METHOD_PAGE : RX_ALLOC_METHOD_SKB)
  */
-static int rx_alloc_method = RX_ALLOC_METHOD_PAGE;
+static int rx_alloc_method = RX_ALLOC_METHOD_AUTO;
 
 #define RX_ALLOC_LEVEL_LRO 0x2000
 #define RX_ALLOC_LEVEL_MAX 0x3000