e1000e: Expose MDI-X status via ethtool change

Ethtool is a standard way of getting information about
ethernet interfaces.  We enhance ethtool kernel interface
& e1000e to make the MDI-X status readable via ethtool in
userspace.

Signed-off-by: Chaitanya Lala <clala@riverbed.com>
Signed-off-by: Arthur Jones <ajones@riverbed.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 16 insertions, 1 deletions

diff --git a/drivers/net/e1000e/ethtool.c b/drivers/net/e1000e/ethtool.c
index 3d6435617527..1bf4d2a5d34f 100644
--- a/drivers/net/e1000e/ethtool.c
+++ b/drivers/net/e1000e/ethtool.c
@@ -167,6 +167,15 @@ static int e1000_get_settings(struct net_device *netdev,
 
         ecmd->autoneg = ((hw->phy.media_type == e1000_media_type_fiber) ||
                          hw->mac.autoneg) ? AUTONEG_ENABLE : AUTONEG_DISABLE;
+
+        /* MDI-X => 2; MDI =>1; Invalid =>0 */
+        if ((hw->phy.media_type == e1000_media_type_copper) &&
+            !hw->mac.get_link_status)
+                ecmd->eth_tp_mdix = hw->phy.is_mdix ? ETH_TP_MDI_X :
+                                                      ETH_TP_MDI;
+        else
+                ecmd->eth_tp_mdix = ETH_TP_MDI_INVALID;
+
         return 0;
 }
 
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 380b04272bf1..9b660bd2e2b3 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -30,7 +30,8 @@ struct ethtool_cmd {
         __u32   maxtxpkt;       /* Tx pkts before generating tx int */
         __u32   maxrxpkt;       /* Rx pkts before generating rx int */
         __u16   speed_hi;
-        __u16   reserved2;
+        __u8    eth_tp_mdix;
+        __u8    reserved2;
         __u32   lp_advertising; /* Features the link partner advertises */
         __u32   reserved[2];
 };
@@ -632,6 +633,11 @@ struct ethtool_ops {
 #define AUTONEG_DISABLE         0x00
 #define AUTONEG_ENABLE          0x01
 
+/* Mode MDI or MDI-X */
+#define ETH_TP_MDI_INVALID      0x00
+#define ETH_TP_MDI              0x01
+#define ETH_TP_MDI_X            0x02
+
 /* Wake-On-Lan options. */
 #define WAKE_PHY                (1 << 0)
 #define WAKE_UCAST              (1 << 1)