Revert "e1000: Try auto-negotiation for fixed 100 or 10 configuration"

We've gotten a report of this breaking a fixed no autoneg setup.

Since no link is worse than what this intends to fix (negotiating full
duplex at forced speed), revert for the undeway 15.0 release cycle
until this can be further reviewed.

PR:		288827
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D47336

This reverts commit 645c45e.

Author: kev009

sys/dev/e1000/e1000_phy.c

@@ -1707,10 +1707,9 @@ s32 e1000_setup_copper_link_generic(struct e1000_hw *hw)
 		 * autonegotiation.
 		 */
 		ret_val = e1000_copper_link_autoneg(hw);
-		if (ret_val && !hw->mac.forced_speed_duplex)
+		if (ret_val)
 			return ret_val;
-	}
-	if (!hw->mac.autoneg || (ret_val && hw->mac.forced_speed_duplex)) {
+	} else {
 		/* PHY will be set to 10H, 10F, 100H or 100F
 		 * depending on user settings.
 		 */

sys/dev/e1000/if_em.c

@@ -2000,18 +2000,7 @@ em_if_media_status(if_ctx_t ctx, struct ifmediareq *ifmr)
 	    (sc->hw.phy.media_type == e1000_media_type_internal_serdes)) {
 		if (sc->hw.mac.type == e1000_82545)
 			fiber_type = IFM_1000_LX;
-		switch (sc->link_speed) {
-		case 10:
-			ifmr->ifm_active |= IFM_10_FL;
-			break;
-		case 100:
-			ifmr->ifm_active |= IFM_100_FX;
-			break;
-		case 1000:
-		default:
-			ifmr->ifm_active |= fiber_type | IFM_FDX;
-			break;
-		}
+		ifmr->ifm_active |= fiber_type | IFM_FDX;
 	} else {
 		switch (sc->link_speed) {
 		case 10:
@@ -2024,12 +2013,11 @@ em_if_media_status(if_ctx_t ctx, struct ifmediareq *ifmr)
 			ifmr->ifm_active |= IFM_1000_T;
 			break;
 		}
+		if (sc->link_duplex == FULL_DUPLEX)
+			ifmr->ifm_active |= IFM_FDX;
+		else
+			ifmr->ifm_active |= IFM_HDX;
 	}
-
-	if (sc->link_duplex == FULL_DUPLEX)
-		ifmr->ifm_active |= IFM_FDX;
-	else
-		ifmr->ifm_active |= IFM_HDX;
 }
 
 /*********************************************************************
@@ -2063,34 +2051,14 @@ em_if_media_change(if_ctx_t ctx)
 		sc->hw.phy.autoneg_advertised = ADVERTISE_1000_FULL;
 		break;
 	case IFM_100_TX:
-		sc->hw.mac.autoneg = DO_AUTO_NEG;
-		if ((ifm->ifm_media & IFM_GMASK) == IFM_FDX) {
-			sc->hw.phy.autoneg_advertised = ADVERTISE_100_FULL;
-			sc->hw.mac.forced_speed_duplex = ADVERTISE_100_FULL;
-		} else {
-			sc->hw.phy.autoneg_advertised = ADVERTISE_100_HALF;
-			sc->hw.mac.forced_speed_duplex = ADVERTISE_100_HALF;
-		}
-		break;
-	case IFM_10_T:
-		sc->hw.mac.autoneg = DO_AUTO_NEG;
-		if ((ifm->ifm_media & IFM_GMASK) == IFM_FDX) {
-			sc->hw.phy.autoneg_advertised = ADVERTISE_10_FULL;
-			sc->hw.mac.forced_speed_duplex = ADVERTISE_10_FULL;
-		} else {
-			sc->hw.phy.autoneg_advertised = ADVERTISE_10_HALF;
-			sc->hw.mac.forced_speed_duplex = ADVERTISE_10_HALF;
-		}
-		break;
-	case IFM_100_FX:
 		sc->hw.mac.autoneg = false;
 		sc->hw.phy.autoneg_advertised = 0;
 		if ((ifm->ifm_media & IFM_GMASK) == IFM_FDX)
 			sc->hw.mac.forced_speed_duplex = ADVERTISE_100_FULL;
 		else
 			sc->hw.mac.forced_speed_duplex = ADVERTISE_100_HALF;
 		break;
-	case IFM_10_FL:
+	case IFM_10_T:
 		sc->hw.mac.autoneg = false;
 		sc->hw.phy.autoneg_advertised = 0;
 		if ((ifm->ifm_media & IFM_GMASK) == IFM_FDX)