diff mbox series

[net-next,v5,5/6] net: dsa: mv88e6xxx: rmon: Use RMU for reading RMON data

Message ID 20220907072950.2329571-6-mattias.forsblad@gmail.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series net: dsa: qca8k, mv88e6xxx: rmon: Add RMU support | expand

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netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 10 this patch: 0
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netdev/verify_fixes success No Fixes tag
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netdev/checkpatch warning WARNING: line length of 87 exceeds 80 columns WARNING: line length of 94 exceeds 80 columns WARNING: line length of 95 exceeds 80 columns WARNING: line length of 97 exceeds 80 columns
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Commit Message

Mattias Forsblad Sept. 7, 2022, 7:29 a.m. UTC 
Use the Remote Management Unit for efficiently accessing
the RMON data.

Signed-off-by: Mattias Forsblad <mattias.forsblad@gmail.com>
---
 drivers/net/dsa/mv88e6xxx/chip.c | 39 ++++++++++++++++++++++++++------
 drivers/net/dsa/mv88e6xxx/chip.h |  2 ++
 2 files changed, 34 insertions(+), 7 deletions(-)

Comments

Andrew Lunn Sept. 7, 2022, 10:36 p.m. UTC | #1 
> @@ -430,6 +431,7 @@ struct mv88e6xxx_bus_ops {
>  	int (*read)(struct mv88e6xxx_chip *chip, int addr, int reg, u16 *val);
>  	int (*write)(struct mv88e6xxx_chip *chip, int addr, int reg, u16 val);
>  	int (*init)(struct mv88e6xxx_chip *chip);
> +	int (*get_rmon)(struct mv88e6xxx_chip *chip, int port, uint64_t *data);
>  };

I think you can make this a lot cleaner. You are adding this get_rmon
op here. Add it to mv88e6xxx_smi_indirect_ops,
mv88e6xxx_smi_direct_ops, and mv88e6xxx_smi_dual_direct_ops, calling
the MDIO version.

Then the top level mv88e6xxx_get_ethtool_stats() just calls the
get_rmon() method in mv88e6xxx_bus_ops.

Notice how mv88e6xxx_smi_init() sets chip->smi_ops depending on the
chip type. What you can do is when RMU is successfully enabled,
replace chip->smi_ops with a version which goes via RMU. You can keep
.read and .write pointing to the MDIO versions for the moment, until
they also use RMU.

Doing it like this removes all the checking is RMU setup or not.

      Andrew
diff mbox series

Patch

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index bbdf229c9e71..f32048de68fc 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -1234,16 +1234,30 @@  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 (mv88e6xxx_rmu_available(chip) &&
+			    !(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++;
 		}
@@ -1312,8 +1326,8 @@  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;
@@ -1327,7 +1341,18 @@  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 RMU isn't available fall back to MDIO access. */
+	if (mv88e6xxx_rmu_available(chip))
+		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)
diff --git a/drivers/net/dsa/mv88e6xxx/chip.h b/drivers/net/dsa/mv88e6xxx/chip.h
index e81935a9573d..c7477b716473 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.h
+++ b/drivers/net/dsa/mv88e6xxx/chip.h
@@ -266,6 +266,7 @@  struct mv88e6xxx_vlan {
 struct mv88e6xxx_port {
 	struct mv88e6xxx_chip *chip;
 	int port;
+	u64 rmu_raw_stats[64];
 	struct mv88e6xxx_vlan bridge_pvid;
 	u64 serdes_stats[2];
 	u64 atu_member_violation;
@@ -430,6 +431,7 @@  struct mv88e6xxx_bus_ops {
 	int (*read)(struct mv88e6xxx_chip *chip, int addr, int reg, u16 *val);
 	int (*write)(struct mv88e6xxx_chip *chip, int addr, int reg, u16 val);
 	int (*init)(struct mv88e6xxx_chip *chip);
+	int (*get_rmon)(struct mv88e6xxx_chip *chip, int port, uint64_t *data);
 };
 
 struct mv88e6xxx_mdio_bus {