[PATCH net-next v2 3/3] rmon: Use RMU if available

[Mattias Forsblad <mattias.forsblad@gmail.com>]

If RMU is supported, use that interface to
collect rmon data.

Signed-off-by: Mattias Forsblad <mattias.forsblad@gmail.com>
---
 drivers/net/dsa/mv88e6xxx/chip.c | 41 ++++++++++++++++++++++++++------
 1 file changed, 34 insertions(+), 7 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 4c0510abd875..0d0241ace708 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -1226,16 +1226,30 @@ static int mv88e6xxx_stats_get_stats(struct mv88e6xxx_chip *chip, int port,
 				     u16 bank1_select, u16 histogram)
 {
 	struct mv88e6xxx_hw_stat *stat;
+	int offset = 0;
+	u64 high;
 	int i, j;
 
 	for (i = 0, j = 0; i < ARRAY_SIZE(mv88e6xxx_hw_stats); i++) {
 		stat = &mv88e6xxx_hw_stats[i];
 		if (stat->type & types) {
-			mv88e6xxx_reg_lock(chip);
-			data[j] = _mv88e6xxx_get_ethtool_stat(chip, stat, port,
-							      bank1_select,
-							      histogram);
-			mv88e6xxx_reg_unlock(chip);
+			if (chip->rmu.ops && chip->rmu.ops->get_rmon &&
+			    !(stat->type & STATS_TYPE_PORT)) {
+				if (stat->type & STATS_TYPE_BANK1)
+					offset = 32;
+
+				data[j] = chip->ports[port].rmu_raw_stats[stat->reg + offset];
+				if (stat->size == 8) {
+					high = chip->ports[port].rmu_raw_stats[stat->reg + offset
+							+ 1];
+					data[j] += (high << 32);
+				}
+			} else {
+				mv88e6xxx_reg_lock(chip);
+				data[j] = _mv88e6xxx_get_ethtool_stat(chip, stat, port,
+								      bank1_select, histogram);
+				mv88e6xxx_reg_unlock(chip);
+			}
 
 			j++;
 		}
@@ -1304,8 +1318,8 @@ static void mv88e6xxx_get_stats(struct mv88e6xxx_chip *chip, int port,
 	mv88e6xxx_reg_unlock(chip);
 }
 
-static void mv88e6xxx_get_ethtool_stats(struct dsa_switch *ds, int port,
-					uint64_t *data)
+static void mv88e6xxx_get_ethtool_stats_mdio(struct dsa_switch *ds, int port,
+					     uint64_t *data)
 {
 	struct mv88e6xxx_chip *chip = ds->priv;
 	int ret;
@@ -1319,7 +1333,20 @@ static void mv88e6xxx_get_ethtool_stats(struct dsa_switch *ds, int port,
 		return;
 
 	mv88e6xxx_get_stats(chip, port, data);
+}
 
+static void mv88e6xxx_get_ethtool_stats(struct dsa_switch *ds, int port,
+					uint64_t *data)
+{
+	struct mv88e6xxx_chip *chip = ds->priv;
+
+	/* If initialization of RMU isn't available
+	 * fall back to MDIO access.
+	 */
+	if (chip->rmu.ops && chip->rmu.ops->get_rmon)
+		chip->rmu.ops->get_rmon(chip, port, data);
+	else
+		mv88e6xxx_get_ethtool_stats_mdio(ds, port, data);
 }
 
 static int mv88e6xxx_get_regs_len(struct dsa_switch *ds, int port)
-- 
2.25.1