generic: provide get_port_stats() on ar8xxx switches

This patch provides a generic switch_dev_ops 'get_port_stats()' callback by
taping into the relevant port MIB counters.

The implementation uses a generic callback that select the correct MIB counter
index based on chip version.

This callback is used by swconfig_leds led trigger to blink LEDs with port
network traffic.

Signed-off-by: Thibaut VARENE <hacks@slashdirt.org>

target/linux/generic/files/drivers/net/phy/ar8216.c

@@ -49,6 +49,12 @@ extern const struct ar8xxx_chip ar8337_chip;
 		.name = (_n),	\
 	}
 
+#define AR8216_MIB_RXB_ID	14	/* RxGoodByte */
+#define AR8216_MIB_TXB_ID	29	/* TxByte */
+
+#define AR8236_MIB_RXB_ID	15	/* RxGoodByte */
+#define AR8236_MIB_TXB_ID	31	/* TxByte */
+
 static const struct ar8xxx_mib_desc ar8216_mibs[] = {
 	MIB_DESC(1, AR8216_STATS_RXBROAD, "RxBroad"),
 	MIB_DESC(1, AR8216_STATS_RXPAUSE, "RxPause"),
@@ -1581,6 +1587,56 @@ ar8xxx_sw_set_flush_port_arl_table(struct switch_dev *dev,
 	return ret;
 }
 
+int
+ar8xxx_sw_get_port_stats(struct switch_dev *dev, int port,
+			struct switch_port_stats *stats)
+{
+	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
+	u64 *mib_stats;
+	int ret;
+	int mib_txb_id, mib_rxb_id;
+
+	if (!ar8xxx_has_mib_counters(priv))
+		return -EOPNOTSUPP;
+
+	if (port >= dev->ports)
+		return -EINVAL;
+
+	switch (priv->chip_ver) {
+		case AR8XXX_VER_AR8216:
+			mib_txb_id = AR8216_MIB_TXB_ID;
+			mib_rxb_id = AR8216_MIB_RXB_ID;
+			break;
+		case AR8XXX_VER_AR8236:
+		case AR8XXX_VER_AR8316:
+		case AR8XXX_VER_AR8327:
+		case AR8XXX_VER_AR8337:
+			mib_txb_id = AR8236_MIB_TXB_ID;
+			mib_rxb_id = AR8236_MIB_RXB_ID;
+			break;
+		default:
+			return -EOPNOTSUPP;
+	}
+
+	mutex_lock(&priv->mib_lock);
+	ret = ar8xxx_mib_capture(priv);
+	if (ret)
+		goto unlock;
+
+	ar8xxx_mib_fetch_port_stat(priv, port, false);
+
+	mib_stats = &priv->mib_stats[port * priv->chip->num_mibs];
+
+	stats->tx_bytes = mib_stats[mib_txb_id];
+	stats->rx_bytes = mib_stats[mib_rxb_id];
+
+	ret = 0;
+
+unlock:
+	mutex_unlock(&priv->mib_lock);
+	return ret;
+}
+
 static const struct switch_attr ar8xxx_sw_attr_globals[] = {
 	{
 		.type = SWITCH_TYPE_INT,
@@ -1696,6 +1752,7 @@ static const struct switch_dev_ops ar8xxx_sw_ops = {
 	.apply_config = ar8xxx_sw_hw_apply,
 	.reset_switch = ar8xxx_sw_reset_switch,
 	.get_port_link = ar8xxx_sw_get_port_link,
+	.get_port_stats = ar8xxx_sw_get_port_stats,
 };
 
 static const struct ar8xxx_chip ar8216_chip = {

target/linux/generic/files/drivers/net/phy/ar8216.h

@@ -566,6 +566,9 @@ ar8xxx_sw_set_flush_port_arl_table(struct switch_dev *dev,
 				   const struct switch_attr *attr,
 				   struct switch_val *val);
 int
+ar8xxx_sw_get_port_stats(struct switch_dev *dev, int port,
+			struct switch_port_stats *stats);
+int
 ar8216_wait_bit(struct ar8xxx_priv *priv, int reg, u32 mask, u32 val);
 
 static inline struct ar8xxx_priv *

target/linux/generic/files/drivers/net/phy/ar8327.c

@@ -1411,6 +1411,7 @@ static const struct switch_dev_ops ar8327_sw_ops = {
 	.apply_config = ar8327_sw_hw_apply,
 	.reset_switch = ar8xxx_sw_reset_switch,
 	.get_port_link = ar8xxx_sw_get_port_link,
+	.get_port_stats = ar8xxx_sw_get_port_stats,
 };
 
 const struct ar8xxx_chip ar8327_chip = {