igb/ixgbe: remove unecessary checks for CHECKSUM_UNNECESSARY

Both of these drivers do a check to verify ip_summed is set to
CHECKSUM_UNNECESSARY prior to passing the packet to GRO.  GRO itself
already does such a check so it is redundant and can be removed as this
will likely cause out of order issues when receiving a packet that didn't
pass checksum validation.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/igb/igb_main.c

@@ -4430,20 +4430,12 @@ static void igb_receive_skb(struct igb_ring *ring, u8 status,
 	bool vlan_extracted = (adapter->vlgrp && (status & E1000_RXD_STAT_VP));
 
 	skb_record_rx_queue(skb, ring->queue_index);
-	if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
-		if (vlan_extracted)
-			vlan_gro_receive(&ring->napi, adapter->vlgrp,
-			                 le16_to_cpu(rx_desc->wb.upper.vlan),
-			                 skb);
-		else
-			napi_gro_receive(&ring->napi, skb);
-	} else {
-		if (vlan_extracted)
-			vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
-			                  le16_to_cpu(rx_desc->wb.upper.vlan));
-		else
-			netif_receive_skb(skb);
-	}
+	if (vlan_extracted)
+		vlan_gro_receive(&ring->napi, adapter->vlgrp,
+		                 le16_to_cpu(rx_desc->wb.upper.vlan),
+		                 skb);
+	else
+		napi_gro_receive(&ring->napi, skb);
 }
 
 static inline void igb_rx_checksum_adv(struct igb_adapter *adapter,

drivers/net/ixgbe/ixgbe_main.c

@@ -459,23 +459,16 @@ static void ixgbe_receive_skb(struct ixgbe_q_vector *q_vector,
 	u16 tag = le16_to_cpu(rx_desc->wb.upper.vlan);
 
 	skb_record_rx_queue(skb, q_vector - &adapter->q_vector[0]);
-	if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
+	if (!(adapter->flags & IXGBE_FLAG_IN_NETPOLL)) {
 		if (adapter->vlgrp && is_vlan && (tag != 0))
 			vlan_gro_receive(napi, adapter->vlgrp, tag, skb);
 		else
 			napi_gro_receive(napi, skb);
 	} else {
-		if (!(adapter->flags & IXGBE_FLAG_IN_NETPOLL)) {
-			if (adapter->vlgrp && is_vlan && (tag != 0))
-				vlan_hwaccel_receive_skb(skb, adapter->vlgrp, tag);
-			else
-				netif_receive_skb(skb);
-		} else {
-			if (adapter->vlgrp && is_vlan && (tag != 0))
-				vlan_hwaccel_rx(skb, adapter->vlgrp, tag);
-			else
-				netif_rx(skb);
-		}
+		if (adapter->vlgrp && is_vlan && (tag != 0))
+			vlan_hwaccel_rx(skb, adapter->vlgrp, tag);
+		else
+			netif_rx(skb);
 	}
 }