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>

drivers/net/e1000/e1000_hw.h

@@ -1875,6 +1875,7 @@ struct e1000_hw {
 #define E1000_MANC_TCO_RESET     0x00010000 /* TCO Reset Occurred */
 #define E1000_MANC_RCV_TCO_EN    0x00020000 /* Receive TCO Packets Enabled */
 #define E1000_MANC_REPORT_STATUS 0x00040000 /* Status Reporting Enabled */
+#define E1000_MANC_RCV_ALL       0x00080000 /* Receive All Enabled */
 #define E1000_MANC_BLK_PHY_RST_ON_IDE   0x00040000 /* Block phy resets */
 #define E1000_MANC_EN_MAC_ADDR_FILTER   0x00100000 /* Enable MAC address
                                                     * filtering */
@@ -2036,6 +2037,7 @@ struct e1000_host_command_info {
 #define EEPROM_INIT_CONTROL1_REG      0x000A
 #define EEPROM_INIT_CONTROL2_REG      0x000F
 #define EEPROM_INIT_CONTROL3_PORT_B   0x0014
+#define EEPROM_INIT_3GIO_3            0x001A
 #define EEPROM_INIT_CONTROL3_PORT_A   0x0024
 #define EEPROM_CFG                    0x0012
 #define EEPROM_FLASH_VERSION          0x0032
@@ -2085,6 +2087,9 @@ struct e1000_host_command_info {
 #define EEPROM_WORD0F_ANE        0x0800
 #define EEPROM_WORD0F_SWPDIO_EXT 0x00F0
 
+/* Mask bits for fields in Word 0x1a of the EEPROM */
+#define EEPROM_WORD1A_ASPM_MASK  0x000C
+
 /* For checksumming, the sum of all words in the EEPROM should equal 0xBABA. */
 #define EEPROM_SUM 0xBABA
 

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