From 29aea9ec7ddbeac001c697bfc0a8b007a6b0aa11 Mon Sep 17 00:00:00 2001
From: Oleg Bulyzhin <oleg@FreeBSD.org>
Date: Tue, 16 May 2006 12:26:00 +0000
Subject: [PATCH] 1) Fix mii_phy_tick():    Current code does not report link
 loss correctly - when link goes down,    mii_phy_tick() will notice that with
 up to mii_anegticks delay.    If link goes up during this delay then link
 flapping will be unnoticed    by driver.

2) mii_phy_add_media(): initialize sc->mii_anegticks for 10/100 media

3) Use MII_ANEGTICKS/MII_ANEGTICKS_GIGE defines instead of hardcoded values.

Approved by:	glebius (mentor)
MFC after:	1 month
---
 sys/dev/mii/mii_physubr.c | 36 ++++++++++++++++++------------------
 1 file changed, 18 insertions(+), 18 deletions(-)

diff --git a/sys/dev/mii/mii_physubr.c b/sys/dev/mii/mii_physubr.c
index 3d71061ac54..cc60966dacd 100644
--- a/sys/dev/mii/mii_physubr.c
+++ b/sys/dev/mii/mii_physubr.c
@@ -219,20 +219,21 @@ mii_phy_tick(struct mii_softc *sc)
 	/* Read the status register twice; BMSR_LINK is latch-low. */
 	reg = PHY_READ(sc, MII_BMSR) | PHY_READ(sc, MII_BMSR);
 	if (reg & BMSR_LINK) {
-		/*
-		 * See above.
-		 */
+		sc->mii_ticks = 0;	/* reset autonegotiation timer. */
+		/* See above. */
 		return (0);
 	}
 
-	/*
-	 * Only retry autonegotiation every N seconds.
-	 */
-	if (sc->mii_anegticks == 0) {
-		sc->mii_anegticks = 17;
+	/* Announce link loss right after it happens */
+	if (sc->mii_ticks++ == 0)
 		return (0);
-	}
-	if (++sc->mii_ticks <= sc->mii_anegticks)
+
+	/* XXX: use default value if phy driver did not set mii_anegticks */
+	if (sc->mii_anegticks == 0)
+		sc->mii_anegticks = MII_ANEGTICKS_GIGE;
+
+	/* Only retry autonegotiation every mii_anegticks ticks. */
+	if (sc->mii_ticks <= sc->mii_anegticks)
 		return (EJUSTRETURN);
 
 	sc->mii_ticks = 0;
@@ -409,6 +410,9 @@ mii_phy_add_media(struct mii_softc *sc)
 	struct mii_data *mii = sc->mii_pdata;
 	const char *sep = "";
 
+	/* Set aneg timer for 10/100 media. Gigabit media handled below. */
+	sc->mii_anegticks = MII_ANEGTICKS;
+
 #define	ADD(m, c)	ifmedia_add(&mii->mii_media, (m), (c), NULL)
 #define	PRINT(s)	printf("%s%s", sep, s); sep = ", "
 
@@ -461,20 +465,16 @@ mii_phy_add_media(struct mii_softc *sc)
 		/*
 		 * XXX Right now only handle 1000SX and 1000TX.  Need
 		 * XXX to handle 1000LX and 1000CX some how.
-		 *
-		 * Note since it can take 5 seconds to auto-negotiate
-		 * a gigabit link, we make anegticks 10 seconds for
-		 * all the gigabit media types.
 		 */
 		if (sc->mii_extcapabilities & EXTSR_1000XHDX) {
-			sc->mii_anegticks = 17;
+			sc->mii_anegticks = MII_ANEGTICKS_GIGE;
 			sc->mii_flags |= MIIF_IS_1000X;
 			ADD(IFM_MAKEWORD(IFM_ETHER, IFM_1000_SX, 0,
 			    sc->mii_inst), MII_MEDIA_1000_X);
 			PRINT("1000baseSX");
 		}
 		if (sc->mii_extcapabilities & EXTSR_1000XFDX) {
-			sc->mii_anegticks = 17;
+			sc->mii_anegticks = MII_ANEGTICKS_GIGE;
 			sc->mii_flags |= MIIF_IS_1000X;
 			ADD(IFM_MAKEWORD(IFM_ETHER, IFM_1000_SX, IFM_FDX,
 			    sc->mii_inst), MII_MEDIA_1000_X_FDX);
@@ -490,7 +490,7 @@ mii_phy_add_media(struct mii_softc *sc)
 		 * All 1000baseT PHYs have a 1000baseT control register.
 		 */
 		if (sc->mii_extcapabilities & EXTSR_1000THDX) {
-			sc->mii_anegticks = 17;
+			sc->mii_anegticks = MII_ANEGTICKS_GIGE;
 			sc->mii_flags |= MIIF_HAVE_GTCR;
 			mii->mii_media.ifm_mask |= IFM_ETH_MASTER;
 			ADD(IFM_MAKEWORD(IFM_ETHER, IFM_1000_T, 0,
@@ -498,7 +498,7 @@ mii_phy_add_media(struct mii_softc *sc)
 			PRINT("1000baseT");
 		}
 		if (sc->mii_extcapabilities & EXTSR_1000TFDX) {
-			sc->mii_anegticks = 17;
+			sc->mii_anegticks = MII_ANEGTICKS_GIGE;
 			sc->mii_flags |= MIIF_HAVE_GTCR;
 			mii->mii_media.ifm_mask |= IFM_ETH_MASTER;
 			ADD(IFM_MAKEWORD(IFM_ETHER, IFM_1000_T, IFM_FDX,