[PATCH 1/1] ixgbe: add the external ixgbe fiber transceiver status

[Zhu Yanjun]

When the ixgbe fiber transceiver is external, it is necessary to get
the present/absent status of this external ixgbe fiber transceiver.

The steps to get the present/absent status:
The enp1s0f0 is an external ixgbe fiber NIC.

ethtool enp1s0f0

...
        Port: FIBRE
        PHYAD: 0
        Transceiver: external(present) <---The transceiver is present.
        Auto-negotiation: on
        Supports Wake-on: d
...

Or
...
        Port: FIBRE
        PHYAD: 0
        Transceiver: external(absent) <---The transceiver is absent
        Auto-negotiation: on
        Supports Wake-on: d
...

Signed-off-by: Zhu Yanjun <yanjun....@oracle.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c | 15 +++++++++++++++
 include/uapi/linux/ethtool.h                     |  4 ++++
 2 files changed, 19 insertions(+)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c 
b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
index fd192bf..b3f86f4 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
@@ -313,6 +313,21 @@ static int ixgbe_get_settings(struct net_device *netdev,
                break;
        }
 
+       /* When the tranceiver is external, the following is meaningful.
+        * ecmd->reserved[0] has 3 values:
+        * 0x0: tranceiver absent
+        * 0x4: tranceiver present
+        * others: not support
+        */
+       if (ecmd->port == PORT_FIBRE) {
+               u32 status = IXGBE_READ_REG(hw, IXGBE_ESDP) & IXGBE_ESDP_SDP2;
+
+               if (status == 0x4)
+                       ecmd->transceiver = XCVR_EXTERNAL_PRESENT;
+               if (status == 0x0)
+                       ecmd->transceiver = XCVR_EXTERNAL_ABSENT;
+       }
+
        /* Indicate pause support */
        ecmd->supported |= SUPPORTED_Pause;
 
diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index 3dc91a4..8e8225a 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -1541,6 +1541,10 @@ static inline int ethtool_validate_duplex(__u8 duplex)
 #define XCVR_DUMMY2            0x03
 #define XCVR_DUMMY3            0x04
 
+/* The fiber transceiver status */
+#define XCVR_EXTERNAL_ABSENT   0x05
+#define XCVR_EXTERNAL_PRESENT  0x06
+
 /* Enable or disable autonegotiation. */
 #define AUTONEG_DISABLE                0x00
 #define AUTONEG_ENABLE         0x01
-- 
2.7.4