e1000e: packet split should not be used with early receive

Originally it was thought there were issues with ICHx/PCH parts with packet
split when jumbo frames were enabled but in fact it is really only when
early-receive is enabled (via ERT register) on these parts.  Use packet
split with jumbos but only when early-receive is not enabled.
Signed-off-by: NBruce Allan <bruce.w.allan@intel.com>
Tested-by: NJeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/e1000e/netdev.c

@@ -2772,7 +2772,7 @@ static void e1000_setup_rctl(struct e1000_adapter *adapter)
 	 * per packet.
 	 */
 	pages = PAGE_USE_COUNT(adapter->netdev->mtu);
-	if (!(adapter->flags & FLAG_IS_ICH) && (pages <= 3) &&
+	if (!(adapter->flags & FLAG_HAS_ERT) && (pages <= 3) &&
 	    (PAGE_SIZE <= 16384) && (rctl & E1000_RCTL_LPE))
 		adapter->rx_ps_pages = pages;
 	else