e1000: Add enabled Jumbo frame support for 82573L

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>

1 files changed, 15 insertions, 1 deletions

diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 6603bd139064..58561a4955e3 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -2978,6 +2978,7 @@ e1000_change_mtu(struct net_device *netdev, int new_mtu)
 {
         struct e1000_adapter *adapter = netdev_priv(netdev);
         int max_frame = new_mtu + ENET_HEADER_SIZE + ETHERNET_FCS_SIZE;
+        uint16_t eeprom_data = 0;
 
         if ((max_frame < MINIMUM_ETHERNET_FRAME_SIZE) ||
             (max_frame > MAX_JUMBO_FRAME_SIZE)) {
@@ -2989,12 +2990,25 @@ e1000_change_mtu(struct net_device *netdev, int new_mtu)
         switch (adapter->hw.mac_type) {
         case e1000_82542_rev2_0:
         case e1000_82542_rev2_1:
-        case e1000_82573:
                 if (max_frame > MAXIMUM_ETHERNET_FRAME_SIZE) {
                         DPRINTK(PROBE, ERR, "Jumbo Frames not supported.\n");
                         return -EINVAL;
                 }
                 break;
+        case e1000_82573:
+                /* only enable jumbo frames if ASPM is disabled completely
+                 * this means both bits must be zero in 0x1A bits 3:2 */
+                e1000_read_eeprom(&adapter->hw, EEPROM_INIT_3GIO_3, 1,
+                                  &eeprom_data);
+                if (eeprom_data & EEPROM_WORD1A_ASPM_MASK) {
+                        if (max_frame > MAXIMUM_ETHERNET_FRAME_SIZE) {
+                                DPRINTK(PROBE, ERR,
+                                        "Jumbo Frames not supported.\n");
+                                return -EINVAL;
+                        }
+                        break;
+                }
+                /* fall through to get support */
         case e1000_82571:
         case e1000_82572:
 #define MAX_STD_JUMBO_FRAME_SIZE 9234