sfc: Set ip_summed correctly for page buffers passed to GRO

Page buffers containing packets with an incorrect checksum or using a
protocol not handled by hardware checksum offload were previously not
passed to LRO.  The conversion to GRO changed this, but did not set
the ip_summed value accordingly.
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/sfc/rx.c

@@ -444,7 +444,8 @@ static void efx_rx_packet__check_len(struct efx_rx_queue *rx_queue,
  * the appropriate LRO method
  */
 static void efx_rx_packet_lro(struct efx_channel *channel,
-			      struct efx_rx_buffer *rx_buf)
+			      struct efx_rx_buffer *rx_buf,
+			      bool checksummed)
 {
 	struct napi_struct *napi = &channel->napi_str;
 
@@ -466,7 +467,8 @@ static void efx_rx_packet_lro(struct efx_channel *channel,
 		skb->len = rx_buf->len;
 		skb->data_len = rx_buf->len;
 		skb->truesize += rx_buf->len;
-		skb->ip_summed = CHECKSUM_UNNECESSARY;
+		skb->ip_summed =
+			checksummed ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE;
 
 		napi_gro_frags(napi);
 
@@ -475,6 +477,7 @@ static void efx_rx_packet_lro(struct efx_channel *channel,
 		rx_buf->page = NULL;
 	} else {
 		EFX_BUG_ON_PARANOID(!rx_buf->skb);
+		EFX_BUG_ON_PARANOID(!checksummed);
 
 		napi_gro_receive(napi, rx_buf->skb);
 		rx_buf->skb = NULL;
@@ -570,7 +573,7 @@ void __efx_rx_packet(struct efx_channel *channel,
 	}
 
 	if (likely(checksummed || rx_buf->page)) {
-		efx_rx_packet_lro(channel, rx_buf);
+		efx_rx_packet_lro(channel, rx_buf, checksummed);
 		goto done;
 	}