qeth: do not turn on SG per default

According to recent performance measurements, turning on net_device
feature NETIF_F_SG only behaves well, but turning on feature
NETIF_F_GSO shows bad results. Since the kernel activates NETIF_F_GSO
automatically as soon as the driver configures feature NETIF_F_SG, qeth
should not activate feature NETIF_F_SG per default, until the qeth
problems with NETIF_F_GSO are solved.
Signed-off-by: NUrsula Braun <ubraun@linux.vnet.ibm.com>
Reviewed-by: NThomas Richter <tmricht@linux.vnet.ibm.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/s390/net/qeth_l2_main.c

@@ -1124,8 +1124,6 @@ static int qeth_l2_setup_netdev(struct qeth_card *card)
 			card->dev->hw_features |= NETIF_F_RXCSUM;
 			card->dev->vlan_features |= NETIF_F_RXCSUM;
 		}
-		/* Turn on SG per default */
-		card->dev->features |= NETIF_F_SG;
 	}
 	card->info.broadcast_capable = 1;
 	qeth_l2_request_initial_mac(card);

drivers/s390/net/qeth_l3_main.c

@@ -3120,7 +3120,6 @@ static int qeth_l3_setup_netdev(struct qeth_card *card)
 				card->dev->vlan_features = NETIF_F_SG |
 					NETIF_F_RXCSUM | NETIF_F_IP_CSUM |
 					NETIF_F_TSO;
-				card->dev->features = NETIF_F_SG;
 			}
 		}
 	} else if (card->info.type == QETH_CARD_TYPE_IQD) {