e1000: Enble early receive (ERT) on 82573

Enable early receives on 82573 for jumbo frame performance. Jumbo's
are only supported on 82573L with ASPM disabled.

Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 38ee39e570ea..93b97c6b8a63 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -1934,6 +1934,12 @@ e1000_configure_rx(struct e1000_adapter *adapter)
                 E1000_WRITE_REG(hw, RXCSUM, rxcsum);
         }
 
+        /* enable early receives on 82573, only takes effect if using > 2048
+         * byte total frame size.  for example only for jumbo frames */
+#define E1000_ERT_2048 0x100
+        if (hw->mac_type == e1000_82573)
+                E1000_WRITE_REG(hw, ERT, E1000_ERT_2048);
+
         /* Enable Receives */
         E1000_WRITE_REG(hw, RCTL, rctl);
 }