net/mlx4_en: Extend usage of napi_gro_frags

We can call napi_gro_frags for all the received traffic regardless
of the checksum status. Specifically, received packets whose status
is CHECKSUM_NONE (and soon to be added CHECKSUM_COMPLETE)
are eligible for napi_gro_frags as well.
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Shani Michaeli <shanim@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx4/en_rx.c

@@ -747,6 +747,16 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
 			if ((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
 			    (cqe->checksum == cpu_to_be16(0xffff))) {
 				ring->csum_ok++;
+				ip_summed = CHECKSUM_UNNECESSARY;
+			} else {
+				ip_summed = CHECKSUM_NONE;
+				ring->csum_none++;
+			}
+		} else {
+			ip_summed = CHECKSUM_NONE;
+			ring->csum_none++;
+		}
+
 		/* This packet is eligible for GRO if it is:
 		 * - DIX Ethernet (type interpretation)
 		 * - TCP/IP (v4)
@@ -769,10 +779,10 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
 			skb_shinfo(gro_skb)->nr_frags = nr;
 			gro_skb->len = length;
 			gro_skb->data_len = length;
-					gro_skb->ip_summed = CHECKSUM_UNNECESSARY;
+			gro_skb->ip_summed = ip_summed;
 
-					if (l2_tunnel)
-						gro_skb->csum_level = 1;
+			if (l2_tunnel && ip_summed == CHECKSUM_UNNECESSARY)
+				gro_skb->encapsulation = 1;
 			if ((cqe->vlan_my_qpn &
 			    cpu_to_be32(MLX4_CQE_VLAN_PRESENT_MASK)) &&
 			    (dev->features & NETIF_F_HW_VLAN_CTAG_RX)) {
@@ -801,16 +811,6 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
 		}
 
 		/* GRO not possible, complete processing here */
-				ip_summed = CHECKSUM_UNNECESSARY;
-			} else {
-				ip_summed = CHECKSUM_NONE;
-				ring->csum_none++;
-			}
-		} else {
-			ip_summed = CHECKSUM_NONE;
-			ring->csum_none++;
-		}
-
 		skb = mlx4_en_rx_skb(priv, rx_desc, frags, length);
 		if (!skb) {
 			priv->stats.rx_dropped++;