net: dsa: mv88e6xxx: Get mv88e6352 SERDES statistics

Add support for reading the SERDES statistics of the mv88e8352, using
the standard ethtool -S option. The SERDES interface can be mapped to
either port 4 or 5, so only return statistics on those ports, if the
SERDES interface is in use.

The counters are reset on read, so need to be accumulated. Add a per
port structure to hold the stats counters. The 6352 only has a single
SERDES interface and so only one port will using the newly added
array. However the 6390 family has as many SERDES interfaces as ports,
each with statistics counters. Also, PTP has a number of counters per
port which will also need accumulating.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/chip.c

@@ -666,7 +666,7 @@ static uint64_t _mv88e6xxx_get_ethtool_stat(struct mv88e6xxx_chip *chip,
 			return UINT64_MAX;
 
 		low = reg;
-		if (s->sizeof_stat == 4) {
+		if (s->size == 4) {
 			err = mv88e6xxx_port_read(chip, port, s->reg + 1, &reg);
 			if (err)
 				return UINT64_MAX;
@@ -679,7 +679,7 @@ static uint64_t _mv88e6xxx_get_ethtool_stat(struct mv88e6xxx_chip *chip,
 	case STATS_TYPE_BANK0:
 		reg |= s->reg | histogram;
 		mv88e6xxx_g1_stats_read(chip, reg, &low);
-		if (s->sizeof_stat == 8)
+		if (s->size == 8)
 			mv88e6xxx_g1_stats_read(chip, reg + 1, &high);
 		break;
 	default:
@@ -3225,6 +3225,9 @@ static const struct mv88e6xxx_ops mv88e6352_ops = {
 	.serdes_power = mv88e6352_serdes_power,
 	.gpio_ops = &mv88e6352_gpio_ops,
 	.avb_ops = &mv88e6352_avb_ops,
+	.serdes_get_sset_count = mv88e6352_serdes_get_sset_count,
+	.serdes_get_strings = mv88e6352_serdes_get_strings,
+	.serdes_get_stats = mv88e6352_serdes_get_stats,
 };
 
 static const struct mv88e6xxx_ops mv88e6390_ops = {

drivers/net/dsa/mv88e6xxx/chip.h

@@ -191,6 +191,10 @@ struct mv88e6xxx_port_hwtstamp {
 	struct hwtstamp_config tstamp_config;
 };
 
+struct mv88e6xxx_port {
+	u64 serdes_stats[2];
+};
+
 struct mv88e6xxx_chip {
 	const struct mv88e6xxx_info *info;
 
@@ -244,6 +248,7 @@ struct mv88e6xxx_chip {
 	int irq;
 	int device_irq;
 	int watchdog_irq;
+
 	int atu_prob_irq;
 	int vtu_prob_irq;
 	struct kthread_worker *kworker;
@@ -268,6 +273,9 @@ struct mv88e6xxx_chip {
 
 	/* Per-port timestamping resources. */
 	struct mv88e6xxx_port_hwtstamp port_hwtstamp[DSA_MAX_PORTS];
+
+	/* Array of port structures. */
+	struct mv88e6xxx_port ports[DSA_MAX_PORTS];
 };
 
 struct mv88e6xxx_bus_ops {
@@ -469,7 +477,7 @@ struct mv88e6xxx_avb_ops {
 
 struct mv88e6xxx_hw_stat {
 	char string[ETH_GSTRING_LEN];
-	int sizeof_stat;
+	size_t size;
 	int reg;
 	int type;
 };

drivers/net/dsa/mv88e6xxx/serdes.c

@@ -87,6 +87,90 @@ int mv88e6352_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on)
 	return 0;
 }
 
+struct mv88e6352_serdes_hw_stat {
+	char string[ETH_GSTRING_LEN];
+	int sizeof_stat;
+	int reg;
+};
+
+static struct mv88e6352_serdes_hw_stat mv88e6352_serdes_hw_stats[] = {
+	{ "serdes_fibre_rx_error", 16, 21 },
+	{ "serdes_PRBS_error", 32, 24 },
+};
+
+int mv88e6352_serdes_get_sset_count(struct mv88e6xxx_chip *chip, int port)
+{
+	if (mv88e6352_port_has_serdes(chip, port))
+		return ARRAY_SIZE(mv88e6352_serdes_hw_stats);
+
+	return 0;
+}
+
+void mv88e6352_serdes_get_strings(struct mv88e6xxx_chip *chip,
+				  int port, uint8_t *data)
+{
+	struct mv88e6352_serdes_hw_stat *stat;
+	int i;
+
+	if (!mv88e6352_port_has_serdes(chip, port))
+		return;
+
+	for (i = 0; i < ARRAY_SIZE(mv88e6352_serdes_hw_stats); i++) {
+		stat = &mv88e6352_serdes_hw_stats[i];
+		memcpy(data + i * ETH_GSTRING_LEN, stat->string,
+		       ETH_GSTRING_LEN);
+	}
+}
+
+static uint64_t mv88e6352_serdes_get_stat(struct mv88e6xxx_chip *chip,
+					  struct mv88e6352_serdes_hw_stat *stat)
+{
+	u64 val = 0;
+	u16 reg;
+	int err;
+
+	err = mv88e6352_serdes_read(chip, stat->reg, &reg);
+	if (err) {
+		dev_err(chip->dev, "failed to read statistic\n");
+		return 0;
+	}
+
+	val = reg;
+
+	if (stat->sizeof_stat == 32) {
+		err = mv88e6352_serdes_read(chip, stat->reg + 1, &reg);
+		if (err) {
+			dev_err(chip->dev, "failed to read statistic\n");
+			return 0;
+		}
+		val = val << 16 | reg;
+	}
+
+	return val;
+}
+
+void mv88e6352_serdes_get_stats(struct mv88e6xxx_chip *chip, int port,
+				uint64_t *data)
+{
+	struct mv88e6xxx_port *mv88e6xxx_port = &chip->ports[port];
+	struct mv88e6352_serdes_hw_stat *stat;
+	u64 value;
+	int i;
+
+	if (!mv88e6352_port_has_serdes(chip, port))
+		return;
+
+	BUILD_BUG_ON(ARRAY_SIZE(mv88e6352_serdes_hw_stats) >
+		     ARRAY_SIZE(mv88e6xxx_port->serdes_stats));
+
+	for (i = 0; i < ARRAY_SIZE(mv88e6352_serdes_hw_stats); i++) {
+		stat = &mv88e6352_serdes_hw_stats[i];
+		value = mv88e6352_serdes_get_stat(chip, stat);
+		mv88e6xxx_port->serdes_stats[i] += value;
+		data[i] = mv88e6xxx_port->serdes_stats[i];
+	}
+}
+
 /* Set the power on/off for 10GBASE-R and 10GBASE-X4/X2 */
 static int mv88e6390_serdes_10g(struct mv88e6xxx_chip *chip, int addr, bool on)
 {

drivers/net/dsa/mv88e6xxx/serdes.h

@@ -44,5 +44,9 @@
 
 int mv88e6352_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on);
 int mv88e6390_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on);
-
+int mv88e6352_serdes_get_sset_count(struct mv88e6xxx_chip *chip, int port);
+void mv88e6352_serdes_get_strings(struct mv88e6xxx_chip *chip,
+				  int port, uint8_t *data);
+void mv88e6352_serdes_get_stats(struct mv88e6xxx_chip *chip, int port,
+				uint64_t *data);
 #endif