diff -r 2bfc262a2606 sys/dev/cxgbe/t4_main.c
--- a/sys/dev/cxgbe/t4_main.c	Tue Jan 02 15:28:30 2018 -0800
+++ b/sys/dev/cxgbe/t4_main.c	Thu May 31 18:28:05 2018 -0700
@@ -2317,7 +2317,7 @@ cxgbe_media_status(struct ifnet *ifp, st
 	ifmr->ifm_status |= IFM_ACTIVE;
 
 	/* ifm_active */
-	ifmr->ifm_active = IFM_ETHER;
+	ifmr->ifm_active = IFM_ETHER | IFM_FDX;
 	ifmr->ifm_active &= ~(IFM_ETH_TXPAUSE | IFM_ETH_RXPAUSE);
 	if (lc->fc & PAUSE_RX)
 		ifmr->ifm_active |= IFM_ETH_RXPAUSE;
@@ -4196,7 +4196,7 @@ set_current_media(struct port_info *pi, 
 	    IFM_SUBTYPE(ifm->ifm_cur->ifm_media) == IFM_NONE)
 		return;
 
-	mword = IFM_ETHER;
+	mword = IFM_ETHER | IFM_FDX;
 	lc = &pi->link_cfg;
 	if (lc->requested_aneg == AUTONEG_ENABLE &&
 	    lc->supported & FW_PORT_CAP_ANEG) {
@@ -4256,11 +4256,11 @@ no_media:
 			} else if (mword == IFM_UNKNOWN)
 				unknown++;
 			else
-				ifmedia_add4(ifm, IFM_ETHER | mword);
+				ifmedia_add4(ifm, IFM_ETHER | IFM_FDX | mword);
 		}
 	}
 	if (unknown > 0) /* Add one unknown for all unknown media types. */
-		ifmedia_add4(ifm, IFM_ETHER | IFM_UNKNOWN);
+		ifmedia_add4(ifm, IFM_ETHER | IFM_FDX | IFM_UNKNOWN);
 	if (lc->supported & FW_PORT_CAP_ANEG)
 		ifmedia_add(ifm, IFM_ETHER | IFM_AUTO, 0, NULL);