cns3xxx: add a small optimization for rx offload

SVN-Revision: 33500

diff --git a/target/linux/cns3xxx/patches-3.3/420-ethernet_optimize_rx_offload.patch b/target/linux/cns3xxx/patches-3.3/420-ethernet_optimize_rx_offload.patch
new file mode 100644 (file)
index 0000000..67929ef
--- /dev/null
+++ b/target/linux/cns3xxx/patches-3.3/420-ethernet_optimize_rx_offload.patch
@@ -0,0 +1,27 @@
+--- a/drivers/net/ethernet/cavium/cns3xxx_eth.c
++++ b/drivers/net/ethernet/cavium/cns3xxx_eth.c
+@@ -653,17 +653,17 @@ static int eth_poll(struct napi_struct *
+                               case 6:
+                               case 13:
+                               case 14:
+-                                      if (desc->l4f)
++                                      if (!desc->l4f) {
++                                              skb->ip_summed = CHECKSUM_UNNECESSARY;
++                                              napi_gro_receive(napi, skb);
+                                               break;
+-
+-                                      skb->ip_summed = CHECKSUM_UNNECESSARY;
+-                                      break;
++                                      }
++                                      /* fall through */
+                               default:
+-                              break;
++                                      netif_receive_skb(skb);
++                                      break;
+                       }
+ 
+-                      napi_gro_receive(napi, skb);
+-
+                       sw->frag_first = NULL;
+                       sw->frag_last = NULL;
+               }