net: fec: enable pause frame to improve rx prefomance for 1G network

The limition of imx6 internal bus cause fec can't achieve 1G perfomance.
There will be many packages lost because FIFO over run.

This patch enable pause frame flow control.

Before this patch
iperf -s -i 1
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 10.192.242.153 port 5001 connected with 10.192.242.94 port 49773
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0- 1.0 sec  6.35 MBytes  53.3 Mbits/sec
[  4]  1.0- 2.0 sec  3.39 MBytes  28.5 Mbits/sec
[  4]  2.0- 3.0 sec  2.63 MBytes  22.1 Mbits/sec
[  4]  3.0- 4.0 sec  1.10 MBytes  9.23 Mbits/sec

ifconfig
   RX packets:46195 errors:1859 dropped:1 overruns:1859 frame:1859

After this patch
iperf -s -i 1

[  4] local 10.192.242.153 port 5001 connected with 10.192.242.94 port 49757
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0- 1.0 sec  49.8 MBytes   418 Mbits/sec
[  4]  1.0- 2.0 sec  50.1 MBytes   420 Mbits/sec
[  4]  2.0- 3.0 sec  47.5 MBytes   399 Mbits/sec
[  4]  3.0- 4.0 sec  45.9 MBytes   385 Mbits/sec
[  4]  4.0- 5.0 sec  44.8 MBytes   376 Mbits/sec

ifconfig
   RX packets:2348454 errors:0 dropped:16 overruns:0 frame:0

Signed-off-by: Frank Li <Frank.Li@freescale.com>
Signed-off-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/freescale/fec.c b/drivers/net/ethernet/freescale/fec.c
index 1b7684a..f52ba33 100644
--- a/drivers/net/ethernet/freescale/fec.c
+++ b/drivers/net/ethernet/freescale/fec.c
@@ -68,6 +68,14 @@
 
 #define DRIVER_NAME	"fec"
 
+/* Pause frame feild and FIFO threshold */
+#define FEC_ENET_FCE	(1 << 5)
+#define FEC_ENET_RSEM_V	0x84
+#define FEC_ENET_RSFL_V	16
+#define FEC_ENET_RAEM_V	0x8
+#define FEC_ENET_RAFL_V	0x8
+#define FEC_ENET_OPD_V	0xFFF0
+
 /* Controller is ENET-MAC */
 #define FEC_QUIRK_ENET_MAC		(1 << 0)
 /* Controller needs driver to swap frame */
@@ -193,6 +201,9 @@
 /* Transmitter timeout */
 #define TX_TIMEOUT (2 * HZ)
 
+#define FEC_PAUSE_FLAG_AUTONEG	0x1
+#define FEC_PAUSE_FLAG_ENABLE	0x2
+
 static int mii_cnt;
 
 static struct bufdesc *fec_enet_get_nextdesc(struct bufdesc *bdp, int is_ex)
@@ -470,6 +481,25 @@
 		}
 #endif
 	}
+
+	/* enable pause frame*/
+	if ((fep->pause_flag & FEC_PAUSE_FLAG_ENABLE) ||
+	    ((fep->pause_flag & FEC_PAUSE_FLAG_AUTONEG) &&
+	     fep->phy_dev && fep->phy_dev->pause)) {
+		rcntl |= FEC_ENET_FCE;
+
+		/* set FIFO thresh hold parameter to reduce overrun */
+		writel(FEC_ENET_RSEM_V, fep->hwp + FEC_R_FIFO_RSEM);
+		writel(FEC_ENET_RSFL_V, fep->hwp + FEC_R_FIFO_RSFL);
+		writel(FEC_ENET_RAEM_V, fep->hwp + FEC_R_FIFO_RAEM);
+		writel(FEC_ENET_RAFL_V, fep->hwp + FEC_R_FIFO_RAFL);
+
+		/* OPD */
+		writel(FEC_ENET_OPD_V, fep->hwp + FEC_OPD);
+	} else {
+		rcntl &= ~FEC_ENET_FCE;
+	}
+
 	writel(rcntl, fep->hwp + FEC_R_CNTRL);
 
 	if (id_entry->driver_data & FEC_QUIRK_ENET_MAC) {
@@ -1016,8 +1046,10 @@
 	}
 
 	/* mask with MAC supported features */
-	if (id_entry->driver_data & FEC_QUIRK_HAS_GBIT)
+	if (id_entry->driver_data & FEC_QUIRK_HAS_GBIT) {
 		phy_dev->supported &= PHY_GBIT_FEATURES;
+		phy_dev->supported |= SUPPORTED_Pause;
+	}
 	else
 		phy_dev->supported &= PHY_BASIC_FEATURES;
 
@@ -1203,7 +1235,55 @@
 	}
 }
 
+static void fec_enet_get_pauseparam(struct net_device *ndev,
+				    struct ethtool_pauseparam *pause)
+{
+	struct fec_enet_private *fep = netdev_priv(ndev);
+
+	pause->autoneg = (fep->pause_flag & FEC_PAUSE_FLAG_AUTONEG) != 0;
+	pause->tx_pause = (fep->pause_flag & FEC_PAUSE_FLAG_ENABLE) != 0;
+	pause->rx_pause = pause->tx_pause;
+}
+
+static int fec_enet_set_pauseparam(struct net_device *ndev,
+				   struct ethtool_pauseparam *pause)
+{
+	struct fec_enet_private *fep = netdev_priv(ndev);
+
+	if (pause->tx_pause != pause->rx_pause) {
+		netdev_info(ndev,
+			"hardware only support enable/disable both tx and rx");
+		return -EINVAL;
+	}
+
+	fep->pause_flag = 0;
+
+	/* tx pause must be same as rx pause */
+	fep->pause_flag |= pause->rx_pause ? FEC_PAUSE_FLAG_ENABLE : 0;
+	fep->pause_flag |= pause->autoneg ? FEC_PAUSE_FLAG_AUTONEG : 0;
+
+	if (pause->rx_pause || pause->autoneg) {
+		fep->phy_dev->supported |= ADVERTISED_Pause;
+		fep->phy_dev->advertising |= ADVERTISED_Pause;
+	} else {
+		fep->phy_dev->supported &= ~ADVERTISED_Pause;
+		fep->phy_dev->advertising &= ~ADVERTISED_Pause;
+	}
+
+	if (pause->autoneg) {
+		if (netif_running(ndev))
+			fec_stop(ndev);
+		phy_start_aneg(fep->phy_dev);
+	}
+	if (netif_running(ndev))
+		fec_restart(ndev, 0);
+
+	return 0;
+}
+
 static const struct ethtool_ops fec_enet_ethtool_ops = {
+	.get_pauseparam		= fec_enet_get_pauseparam,
+	.set_pauseparam		= fec_enet_set_pauseparam,
 	.get_settings		= fec_enet_get_settings,
 	.set_settings		= fec_enet_set_settings,
 	.get_drvinfo		= fec_enet_get_drvinfo,
@@ -1643,6 +1723,11 @@
 	/* setup board info structure */
 	fep = netdev_priv(ndev);
 
+	/* default enable pause frame auto negotiation */
+	if (pdev->id_entry &&
+	    (pdev->id_entry->driver_data & FEC_QUIRK_HAS_GBIT))
+		fep->pause_flag |= FEC_PAUSE_FLAG_AUTONEG;
+
 	fep->hwp = ioremap(r->start, resource_size(r));
 	fep->pdev = pdev;
 	fep->dev_id = dev_id++;