drivers: net: cpsw: add support to dump ALE table via ethtool register dump

Add support to view addresses added by the driver and learnt by the
hardware from ALE table via ethtool register dump interface.
Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/ti/cpsw.c

@@ -1675,14 +1675,34 @@ static const struct net_device_ops cpsw_netdev_ops = {
 	.ndo_vlan_rx_kill_vid	= cpsw_ndo_vlan_rx_kill_vid,
 };
 
+static int cpsw_get_regs_len(struct net_device *ndev)
+{
+	struct cpsw_priv *priv = netdev_priv(ndev);
+
+	return priv->data.ale_entries * ALE_ENTRY_WORDS * sizeof(u32);
+}
+
+static void cpsw_get_regs(struct net_device *ndev,
+			  struct ethtool_regs *regs, void *p)
+{
+	struct cpsw_priv *priv = netdev_priv(ndev);
+	u32 *reg = p;
+
+	/* update CPSW IP version */
+	regs->version = priv->version;
+
+	cpsw_ale_dump(priv->ale, reg);
+}
+
 static void cpsw_get_drvinfo(struct net_device *ndev,
 			     struct ethtool_drvinfo *info)
 {
 	struct cpsw_priv *priv = netdev_priv(ndev);
 
-	strlcpy(info->driver, "TI CPSW Driver v1.0", sizeof(info->driver));
+	strlcpy(info->driver, "cpsw", sizeof(info->driver));
 	strlcpy(info->version, "1.0", sizeof(info->version));
 	strlcpy(info->bus_info, priv->pdev->name, sizeof(info->bus_info));
+	info->regdump_len = cpsw_get_regs_len(ndev);
 }
 
 static u32 cpsw_get_msglevel(struct net_device *ndev)
@@ -1790,6 +1810,8 @@ static const struct ethtool_ops cpsw_ethtool_ops = {
 	.get_ethtool_stats	= cpsw_get_ethtool_stats,
 	.get_wol	= cpsw_get_wol,
 	.set_wol	= cpsw_set_wol,
+	.get_regs_len	= cpsw_get_regs_len,
+	.get_regs	= cpsw_get_regs,
 };
 
 static void cpsw_slave_init(struct cpsw_slave *slave, struct cpsw_priv *priv,

drivers/net/ethernet/ti/cpsw_ale.c

@@ -25,8 +25,6 @@
 #include "cpsw_ale.h"
 
 #define BITMASK(bits)		(BIT(bits) - 1)
-#define ALE_ENTRY_BITS		68
-#define ALE_ENTRY_WORDS	DIV_ROUND_UP(ALE_ENTRY_BITS, 32)
 
 #define ALE_VERSION_MAJOR(rev)	((rev >> 8) & 0xff)
 #define ALE_VERSION_MINOR(rev)	(rev & 0xff)
@@ -763,3 +761,13 @@ int cpsw_ale_destroy(struct cpsw_ale *ale)
 	kfree(ale);
 	return 0;
 }
+
+void cpsw_ale_dump(struct cpsw_ale *ale, u32 *data)
+{
+	int i;
+
+	for (i = 0; i < ale->params.ale_entries; i++) {
+		cpsw_ale_read(ale, i, data);
+		data += ALE_ENTRY_WORDS;
+	}
+}

drivers/net/ethernet/ti/cpsw_ale.h

@@ -80,6 +80,9 @@ enum cpsw_ale_port_state {
 #define ALE_MCAST_FWD_LEARN		2
 #define ALE_MCAST_FWD_2			3
 
+#define ALE_ENTRY_BITS		68
+#define ALE_ENTRY_WORDS	DIV_ROUND_UP(ALE_ENTRY_BITS, 32)
+
 struct cpsw_ale *cpsw_ale_create(struct cpsw_ale_params *params);
 int cpsw_ale_destroy(struct cpsw_ale *ale);
 
@@ -104,5 +107,6 @@ int cpsw_ale_del_vlan(struct cpsw_ale *ale, u16 vid, int port);
 int cpsw_ale_control_get(struct cpsw_ale *ale, int port, int control);
 int cpsw_ale_control_set(struct cpsw_ale *ale, int port,
 			 int control, int value);
+void cpsw_ale_dump(struct cpsw_ale *ale, u32 *data);
 
 #endif