[PATCH net-next 5/8] net: dsa: microchip: add support for ethtool port counters

[Prasanna Vengateshan <prasanna.vengateshan@microchip.com>]

Reused the KSZ common APIs for get_ethtool_stats() & get_sset_count()
along with relevant lan937x hooks for KSZ common layer and added
support for get_strings()

Signed-off-by: Prasanna Vengateshan <prasanna.vengateshan@microchip.com>
---
 drivers/net/dsa/microchip/lan937x_dev.c  | 36 ++++++++++++++++++++++++
 drivers/net/dsa/microchip/lan937x_main.c | 18 ++++++++++++
 2 files changed, 54 insertions(+)

diff --git a/drivers/net/dsa/microchip/lan937x_dev.c b/drivers/net/dsa/microchip/lan937x_dev.c
index 84540180ff2f..20ee485fb796 100644
--- a/drivers/net/dsa/microchip/lan937x_dev.c
+++ b/drivers/net/dsa/microchip/lan937x_dev.c
@@ -209,6 +209,40 @@ static void lan937x_flush_dyn_mac_table(struct ksz_device *dev, int port)
 	}
 }
 
+static void lan937x_r_mib_cnt(struct ksz_device *dev, int port, u16 addr,
+			      u64 *cnt)
+{
+	unsigned int val;
+	u32 data;
+	int ret;
+
+	/* Enable MIB Counter read*/
+	data = MIB_COUNTER_READ;
+	data |= (addr << MIB_COUNTER_INDEX_S);
+	lan937x_pwrite32(dev, port, REG_PORT_MIB_CTRL_STAT__4, data);
+
+	ret = regmap_read_poll_timeout(dev->regmap[2],
+				       PORT_CTRL_ADDR(port,
+						      REG_PORT_MIB_CTRL_STAT__4),
+					   val, !(val & MIB_COUNTER_READ), 10, 1000);
+	/* failed to read MIB. get out of loop */
+	if (ret) {
+		dev_err(dev->dev, "Failed to get MIB\n");
+		return;
+	}
+
+	/* count resets upon read */
+	lan937x_pread32(dev, port, REG_PORT_MIB_DATA, &data);
+	*cnt += data;
+}
+
+static void lan937x_r_mib_pkt(struct ksz_device *dev, int port, u16 addr,
+			      u64 *dropped, u64 *cnt)
+{
+	addr = lan937x_mib_names[addr].index;
+	lan937x_r_mib_cnt(dev, port, addr, cnt);
+}
+
 static void lan937x_port_init_cnt(struct ksz_device *dev, int port)
 {
 	struct ksz_port_mib *mib = &dev->ports[port].mib;
@@ -851,6 +885,8 @@ const struct ksz_dev_ops lan937x_dev_ops = {
 	.cfg_port_member = lan937x_cfg_port_member,
 	.flush_dyn_mac_table = lan937x_flush_dyn_mac_table,
 	.port_setup = lan937x_port_setup,
+	.r_mib_cnt = lan937x_r_mib_cnt,
+	.r_mib_pkt = lan937x_r_mib_pkt,
 	.port_init_cnt = lan937x_port_init_cnt,
 	.shutdown = lan937x_reset_switch,
 	.detect = lan937x_switch_detect,
diff --git a/drivers/net/dsa/microchip/lan937x_main.c b/drivers/net/dsa/microchip/lan937x_main.c
index b38735e36aef..5693c59df497 100644
--- a/drivers/net/dsa/microchip/lan937x_main.c
+++ b/drivers/net/dsa/microchip/lan937x_main.c
@@ -69,6 +69,21 @@ static int lan937x_phy_write16(struct dsa_switch *ds, int addr, int reg,
 	return lan937x_t1_tx_phy_write(dev, addr, reg, val);
 }
 
+static void lan937x_get_strings(struct dsa_switch *ds, int port,
+				u32 stringset, uint8_t *buf)
+{
+	struct ksz_device *dev = ds->priv;
+	int i;
+
+	if (stringset != ETH_SS_STATS)
+		return;
+
+	for (i = 0; i < dev->mib_cnt; i++) {
+		memcpy(buf + i * ETH_GSTRING_LEN, lan937x_mib_names[i].string,
+		       ETH_GSTRING_LEN);
+	}
+}
+
 static void lan937x_port_stp_state_set(struct dsa_switch *ds, int port,
 				       u8 state)
 {
@@ -371,6 +386,9 @@ const struct dsa_switch_ops lan937x_switch_ops = {
 	.phy_read		= lan937x_phy_read16,
 	.phy_write		= lan937x_phy_write16,
 	.port_enable		= ksz_enable_port,
+	.get_strings		= lan937x_get_strings,
+	.get_ethtool_stats	= ksz_get_ethtool_stats,
+	.get_sset_count		= ksz_sset_count,
 	.port_bridge_join	= ksz_port_bridge_join,
 	.port_bridge_leave	= ksz_port_bridge_leave,
 	.port_stp_state_set	= lan937x_port_stp_state_set,
-- 
2.25.1