igb: Support for 100base-fx SFP

This patch adds support for 100base-fx SFP and report proper link speed/duplex
via Ethtool.

v2: fix smatch warnings

CC: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Akeem G Abodunrin <akeem.g.abodunrin@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 13 insertions, 5 deletions

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 8496adfc6a68..0a465ae1cdfa 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -7008,11 +7008,19 @@ int igb_set_spd_dplx(struct igb_adapter *adapter, u32 spd, u8 dplx)
         if ((spd & 1) || (dplx & ~1))
                 goto err_inval;
 
-        /* Fiber NIC's only allow 1000 Gbps Full duplex */
-        if ((adapter->hw.phy.media_type == e1000_media_type_internal_serdes) &&
-            spd != SPEED_1000 &&
-            dplx != DUPLEX_FULL)
-                goto err_inval;
+        /* Fiber NIC's only allow 1000 gbps Full duplex
+         * and 100Mbps Full duplex for 100baseFx sfp
+         */
+        if (adapter->hw.phy.media_type == e1000_media_type_internal_serdes) {
+                switch (spd + dplx) {
+                case SPEED_10 + DUPLEX_HALF:
+                case SPEED_10 + DUPLEX_FULL:
+                case SPEED_100 + DUPLEX_HALF:
+                        goto err_inval;
+                default:
+                        break;
+                }
+        }
 
         switch (spd + dplx) {
         case SPEED_10 + DUPLEX_HALF: