net: dsa: bcm_sf2: Add support for CFP statistics

Return CFP policer statistics (Green, Yellow or Red) as part of the
standard ethtool statistics. This helps debug when CFP rules may not be
hit (0 counter).

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/bcm_sf2_cfp.c

@@ -1201,3 +1201,91 @@ int bcm_sf2_cfp_resume(struct dsa_switch *ds)
 
 	return ret;
 }
+
+static const struct bcm_sf2_cfp_stat {
+	unsigned int offset;
+	unsigned int ram_loc;
+	const char *name;
+} bcm_sf2_cfp_stats[] = {
+	{
+		.offset = CORE_STAT_GREEN_CNTR,
+		.ram_loc = GREEN_STAT_RAM,
+		.name = "Green"
+	},
+	{
+		.offset = CORE_STAT_YELLOW_CNTR,
+		.ram_loc = YELLOW_STAT_RAM,
+		.name = "Yellow"
+	},
+	{
+		.offset = CORE_STAT_RED_CNTR,
+		.ram_loc = RED_STAT_RAM,
+		.name = "Red"
+	},
+};
+
+void bcm_sf2_cfp_get_strings(struct dsa_switch *ds, int port,
+			     u32 stringset, uint8_t *data)
+{
+	struct bcm_sf2_priv *priv = bcm_sf2_to_priv(ds);
+	unsigned int s = ARRAY_SIZE(bcm_sf2_cfp_stats);
+	char buf[ETH_GSTRING_LEN];
+	unsigned int i, j, iter;
+
+	if (stringset != ETH_SS_STATS)
+		return;
+
+	for (i = 1; i < priv->num_cfp_rules; i++) {
+		for (j = 0; j < s; j++) {
+			snprintf(buf, sizeof(buf),
+				 "CFP%03d_%sCntr",
+				 i, bcm_sf2_cfp_stats[j].name);
+			iter = (i - 1) * s + j;
+			strlcpy(data + iter * ETH_GSTRING_LEN,
+				buf, ETH_GSTRING_LEN);
+		}
+	}
+}
+
+void bcm_sf2_cfp_get_ethtool_stats(struct dsa_switch *ds, int port,
+				   uint64_t *data)
+{
+	struct bcm_sf2_priv *priv = bcm_sf2_to_priv(ds);
+	unsigned int s = ARRAY_SIZE(bcm_sf2_cfp_stats);
+	const struct bcm_sf2_cfp_stat *stat;
+	unsigned int i, j, iter;
+	struct cfp_rule *rule;
+	int ret;
+
+	mutex_lock(&priv->cfp.lock);
+	for (i = 1; i < priv->num_cfp_rules; i++) {
+		rule = bcm_sf2_cfp_rule_find(priv, port, i);
+		if (!rule)
+			continue;
+
+		for (j = 0; j < s; j++) {
+			stat = &bcm_sf2_cfp_stats[j];
+
+			bcm_sf2_cfp_rule_addr_set(priv, i);
+			ret = bcm_sf2_cfp_op(priv, stat->ram_loc | OP_SEL_READ);
+			if (ret)
+				continue;
+
+			iter = (i - 1) * s + j;
+			data[iter] = core_readl(priv, stat->offset);
+		}
+
+	}
+	mutex_unlock(&priv->cfp.lock);
+}
+
+int bcm_sf2_cfp_get_sset_count(struct dsa_switch *ds, int port, int sset)
+{
+	struct bcm_sf2_priv *priv = bcm_sf2_to_priv(ds);
+
+	if (sset != ETH_SS_STATS)
+		return 0;
+
+	/* 3 counters per CFP rules */
+	return (priv->num_cfp_rules - 1) * ARRAY_SIZE(bcm_sf2_cfp_stats);
+}