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Date:   Thu, 28 May 2020 12:44:10 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     andrew@...n.ch, f.fainelli@...il.com, vivien.didelot@...il.com,
        davem@...emloft.net
Cc:     netdev@...r.kernel.org
Subject: [PATCH net-next] net: dsa: felix: support half-duplex link modes

From: Vladimir Oltean <vladimir.oltean@....com>

Ping tested:

[   11.808455] mscc_felix 0000:00:00.5 swp0: Link is Up - 1Gbps/Full - flow control rx/tx
[   11.816497] IPv6: ADDRCONF(NETDEV_CHANGE): swp0: link becomes ready

[root@...028ARDB ~] # ethtool -s swp0 advertise 0x4
[   18.844591] mscc_felix 0000:00:00.5 swp0: Link is Down
[   22.048337] mscc_felix 0000:00:00.5 swp0: Link is Up - 100Mbps/Half - flow control off

[root@...028ARDB ~] # ip addr add 192.168.1.1/24 dev swp0

[root@...028ARDB ~] # ping 192.168.1.2
PING 192.168.1.2 (192.168.1.2): 56 data bytes
(...)
^C--- 192.168.1.2 ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 0.383/0.611/1.051 ms

[root@...028ARDB ~] # ethtool -s swp0 advertise 0x10
[  355.637747] mscc_felix 0000:00:00.5 swp0: Link is Down
[  358.788034] mscc_felix 0000:00:00.5 swp0: Link is Up - 1Gbps/Half - flow control off

[root@...028ARDB ~] # ping 192.168.1.2
PING 192.168.1.2 (192.168.1.2): 56 data bytes
(...)
^C
--- 192.168.1.2 ping statistics ---
16 packets transmitted, 16 packets received, 0% packet loss
round-trip min/avg/max = 0.301/0.384/1.138 ms

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/dsa/ocelot/felix.c         |  4 +++-
 drivers/net/dsa/ocelot/felix_vsc9959.c | 13 ++++++++-----
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/net/dsa/ocelot/felix.c b/drivers/net/dsa/ocelot/felix.c
index 66648986e6e3..e5ec1bf90eb0 100644
--- a/drivers/net/dsa/ocelot/felix.c
+++ b/drivers/net/dsa/ocelot/felix.c
@@ -171,14 +171,16 @@ static void felix_phylink_validate(struct dsa_switch *ds, int port,
 		return;
 	}
 
-	/* No half-duplex. */
 	phylink_set_port_modes(mask);
 	phylink_set(mask, Autoneg);
 	phylink_set(mask, Pause);
 	phylink_set(mask, Asym_Pause);
 	phylink_set(mask, 10baseT_Full);
+	phylink_set(mask, 10baseT_Half);
 	phylink_set(mask, 100baseT_Full);
+	phylink_set(mask, 100baseT_Half);
 	phylink_set(mask, 1000baseT_Full);
+	phylink_set(mask, 1000baseT_Half);
 
 	if (state->interface == PHY_INTERFACE_MODE_INTERNAL ||
 	    state->interface == PHY_INTERFACE_MODE_2500BASEX ||
diff --git a/drivers/net/dsa/ocelot/felix_vsc9959.c b/drivers/net/dsa/ocelot/felix_vsc9959.c
index 1dd9e348152d..e706677bcb01 100644
--- a/drivers/net/dsa/ocelot/felix_vsc9959.c
+++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
@@ -817,12 +817,12 @@ static void vsc9959_pcs_init_sgmii(struct phy_device *pcs,
 
 		phy_write(pcs, MII_BMCR, BMCR_ANRESTART | BMCR_ANENABLE);
 	} else {
+		u16 duplex = 0;
 		int speed;
 
-		if (state->duplex == DUPLEX_HALF) {
-			phydev_err(pcs, "Half duplex not supported\n");
-			return;
-		}
+		if (state->duplex == DUPLEX_FULL)
+			duplex = BMCR_FULLDPLX;
+
 		switch (state->speed) {
 		case SPEED_1000:
 			speed = ENETC_PCS_SPEED_1000;
@@ -848,7 +848,7 @@ static void vsc9959_pcs_init_sgmii(struct phy_device *pcs,
 		/* Yes, not a mistake: speed is given by IF_MODE. */
 		phy_write(pcs, MII_BMCR, BMCR_RESET |
 					 BMCR_SPEED1000 |
-					 BMCR_FULLDPLX);
+					 duplex);
 	}
 }
 
@@ -925,8 +925,11 @@ static void vsc9959_pcs_init(struct ocelot *ocelot, int port,
 			       ARRAY_SIZE(phy_basic_ports_array),
 			       pcs->supported);
 	linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, pcs->supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, pcs->supported);
 	linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, pcs->supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, pcs->supported);
 	linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, pcs->supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, pcs->supported);
 	if (pcs->interface == PHY_INTERFACE_MODE_2500BASEX ||
 	    pcs->interface == PHY_INTERFACE_MODE_USXGMII)
 		linkmode_set_bit(ETHTOOL_LINK_MODE_2500baseX_Full_BIT,
-- 
2.25.1

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