net: mvpp2: set maximum packet size for 10G ports

Set maximum packet size for XLG 10G ports. Missing maximum packet size
for XLG configuration will cause kernel panic if oversized packet is
received by port.
Signed-off-by: Stefan Chulski <stefanc@marvell.com>
Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/mvpp2.c

@@ -363,7 +363,9 @@
 #define     MVPP22_XLG_CTRL0_MAC_RESET_DIS	BIT(1)
 #define     MVPP22_XLG_CTRL0_RX_FLOW_CTRL_EN	BIT(7)
 #define     MVPP22_XLG_CTRL0_MIB_CNT_DIS	BIT(14)
-
+#define MVPP22_XLG_CTRL1_REG			0x104
+#define     MVPP22_XLG_CTRL1_FRAMESIZELIMIT	BIT(0)
+#define     MVPP22_XLG_CTRL1_FRAMESIZELIMIT_MASK	0x1fff
 #define MVPP22_XLG_CTRL3_REG			0x11c
 #define     MVPP22_XLG_CTRL3_MACMODESELECT_MASK	(7 << 13)
 #define     MVPP22_XLG_CTRL3_MACMODESELECT_GMAC	(0 << 13)
@@ -4498,6 +4500,18 @@ static inline void mvpp2_gmac_max_rx_size_set(struct mvpp2_port *port)
 	writel(val, port->base + MVPP2_GMAC_CTRL_0_REG);
 }
 
+/* Change maximum receive size of the port */
+static inline void mvpp2_xlg_max_rx_size_set(struct mvpp2_port *port)
+{
+	u32 val;
+
+	val =  readl(port->base + MVPP22_XLG_CTRL1_REG);
+	val &= ~MVPP22_XLG_CTRL1_FRAMESIZELIMIT_MASK;
+	val |= ((port->pkt_size - MVPP2_MH_SIZE) / 2) <<
+	       MVPP22_XLG_CTRL1_FRAMESIZELIMIT;
+	writel(val, port->base + MVPP22_XLG_CTRL1_REG);
+}
+
 /* Set defaults to the MVPP2 port */
 static void mvpp2_defaults_set(struct mvpp2_port *port)
 {
@@ -6076,7 +6090,13 @@ static void mvpp2_start_dev(struct mvpp2_port *port)
 	struct net_device *ndev = port->dev;
 	int i;
 
+	if (port->gop_id == 0 &&
+	    (port->phy_interface == PHY_INTERFACE_MODE_XAUI ||
+	     port->phy_interface == PHY_INTERFACE_MODE_10GKR))
+		mvpp2_xlg_max_rx_size_set(port);
+	else
 		mvpp2_gmac_max_rx_size_set(port);
+
 	mvpp2_txp_max_tx_size_set(port);
 
 	for (i = 0; i < port->nqvecs; i++)