[e1000] Add PHY master/slave #define override

* Add PHY master/slave #define override to address link issues
  with 82541/7 (rev2) against some low-end switches.  Forcing
  master will improve the time-to-link against these switches.

drivers/net/e1000/e1000.h

@@ -124,6 +124,11 @@ struct e1000_adapter;
 #define AUTO_ALL_MODES       0
 #define E1000_EEPROM_APME    0x0400
 
+#ifndef E1000_MASTER_SLAVE
+/* Switch to override PHY master/slave setting */
+#define E1000_MASTER_SLAVE	e1000_ms_hw_default
+#endif
+
 /* only works for sizes that are powers of 2 */
 #define E1000_ROUNDUP(i, size) ((i) = (((i) + (size) - 1) & ~((size) - 1)))
 

drivers/net/e1000/e1000_main.c

@@ -641,6 +641,7 @@ e1000_sw_init(struct e1000_adapter *adapter)
 	if(hw->media_type == e1000_media_type_copper) {
 		hw->mdix = AUTO_ALL_MODES;
 		hw->disable_polarity_correction = FALSE;
+		hw->master_slave = E1000_MASTER_SLAVE;
 	}
 
 	atomic_set(&adapter->irq_sem, 1);