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Message-Id: <20241221081530.3003900-8-o.rempel@pengutronix.de>
Date: Sat, 21 Dec 2024 09:15:29 +0100
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Andrew Lunn <andrew+netdev@...n.ch>,
Heiner Kallweit <hkallweit1@...il.com>,
Jonathan Corbet <corbet@....net>
Cc: Oleksij Rempel <o.rempel@...gutronix.de>,
kernel@...gutronix.de,
linux-kernel@...r.kernel.org,
netdev@...r.kernel.org,
Simon Horman <horms@...nel.org>,
Russell King <linux@...linux.org.uk>,
Maxime Chevallier <maxime.chevallier@...tlin.com>,
linux-doc@...r.kernel.org
Subject: [PATCH net-next v4 7/8] net: phy: dp83td510: add statistics support
Add support for reporting PHY statistics in the DP83TD510 driver. This
includes cumulative tracking of transmit/receive packet counts, and
error counts. Implemented functions to update and provide statistics via
ethtool, with optional polling support enabled through `PHY_POLL_STATS`.
Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
changes v2:
- drop use of FIELD_GET
- add comments
---
drivers/net/phy/dp83td510.c | 112 ++++++++++++++++++++++++++++++++++++
1 file changed, 112 insertions(+)
diff --git a/drivers/net/phy/dp83td510.c b/drivers/net/phy/dp83td510.c
index 92aa3a2b9744..2edda7c231fc 100644
--- a/drivers/net/phy/dp83td510.c
+++ b/drivers/net/phy/dp83td510.c
@@ -34,6 +34,29 @@
#define DP83TD510E_CTRL_HW_RESET BIT(15)
#define DP83TD510E_CTRL_SW_RESET BIT(14)
+/*
+ * DP83TD510E_PKT_STAT_x registers correspond to similarly named registers
+ * in the datasheet (PKT_STAT_1 through PKT_STAT_6). These registers store
+ * 32-bit or 16-bit counters for TX and RX statistics and must be read in
+ * sequence to ensure the counters are cleared correctly.
+ *
+ * - DP83TD510E_PKT_STAT_1: Contains TX packet count bits [15:0].
+ * - DP83TD510E_PKT_STAT_2: Contains TX packet count bits [31:16].
+ * - DP83TD510E_PKT_STAT_3: Contains TX error packet count.
+ * - DP83TD510E_PKT_STAT_4: Contains RX packet count bits [15:0].
+ * - DP83TD510E_PKT_STAT_5: Contains RX packet count bits [31:16].
+ * - DP83TD510E_PKT_STAT_6: Contains RX error packet count.
+ *
+ * Keeping the register names as defined in the datasheet helps maintain
+ * clarity and alignment with the documentation.
+ */
+#define DP83TD510E_PKT_STAT_1 0x12b
+#define DP83TD510E_PKT_STAT_2 0x12c
+#define DP83TD510E_PKT_STAT_3 0x12d
+#define DP83TD510E_PKT_STAT_4 0x12e
+#define DP83TD510E_PKT_STAT_5 0x12f
+#define DP83TD510E_PKT_STAT_6 0x130
+
#define DP83TD510E_AN_STAT_1 0x60c
#define DP83TD510E_MASTER_SLAVE_RESOL_FAIL BIT(15)
@@ -58,8 +81,16 @@ static const u16 dp83td510_mse_sqi_map[] = {
0x0000 /* 24dB =< SNR */
};
+struct dp83td510_stats {
+ u64 tx_pkt_cnt;
+ u64 tx_err_pkt_cnt;
+ u64 rx_pkt_cnt;
+ u64 rx_err_pkt_cnt;
+};
+
struct dp83td510_priv {
bool alcd_test_active;
+ struct dp83td510_stats stats;
};
/* Time Domain Reflectometry (TDR) Functionality of DP83TD510 PHY
@@ -177,6 +208,85 @@ struct dp83td510_priv {
#define DP83TD510E_ALCD_COMPLETE BIT(15)
#define DP83TD510E_ALCD_CABLE_LENGTH GENMASK(10, 0)
+/**
+ * dp83td510_update_stats - Update the PHY statistics for the DP83TD510 PHY.
+ * @phydev: Pointer to the phy_device structure.
+ *
+ * The function reads the PHY statistics registers and updates the statistics
+ * structure.
+ *
+ * Returns: 0 on success or a negative error code on failure.
+ */
+static int dp83td510_update_stats(struct phy_device *phydev)
+{
+ struct dp83td510_priv *priv = phydev->priv;
+ u32 count;
+ int ret;
+
+ /* The DP83TD510E_PKT_STAT registers are divided into two groups:
+ * - Group 1 (TX stats): DP83TD510E_PKT_STAT_1 to DP83TD510E_PKT_STAT_3
+ * - Group 2 (RX stats): DP83TD510E_PKT_STAT_4 to DP83TD510E_PKT_STAT_6
+ *
+ * Registers in each group are cleared only after reading them in a
+ * plain sequence (e.g., 1, 2, 3 for Group 1 or 4, 5, 6 for Group 2).
+ * Any deviation from the sequence, such as reading 1, 2, 1, 2, 3, will
+ * prevent the group from being cleared. Additionally, the counters
+ * for a group are frozen as soon as the first register in that group
+ * is accessed.
+ */
+ ret = phy_read_mmd(phydev, MDIO_MMD_VEND2, DP83TD510E_PKT_STAT_1);
+ if (ret < 0)
+ return ret;
+ /* tx_pkt_cnt_15_0 */
+ count = ret;
+
+ ret = phy_read_mmd(phydev, MDIO_MMD_VEND2, DP83TD510E_PKT_STAT_2);
+ if (ret < 0)
+ return ret;
+ /* tx_pkt_cnt_31_16 */
+ count |= ret << 16;
+ ethtool_stat_add(&priv->stats.tx_pkt_cnt, count);
+
+ ret = phy_read_mmd(phydev, MDIO_MMD_VEND2, DP83TD510E_PKT_STAT_3);
+ if (ret < 0)
+ return ret;
+ /* tx_err_pkt_cnt */
+ ethtool_stat_add(&priv->stats.tx_err_pkt_cnt, ret);
+
+ ret = phy_read_mmd(phydev, MDIO_MMD_VEND2, DP83TD510E_PKT_STAT_4);
+ if (ret < 0)
+ return ret;
+ /* rx_pkt_cnt_15_0 */
+ count = ret;
+
+ ret = phy_read_mmd(phydev, MDIO_MMD_VEND2, DP83TD510E_PKT_STAT_5);
+ if (ret < 0)
+ return ret;
+ /* rx_pkt_cnt_31_16 */
+ count |= ret << 16;
+ ethtool_stat_add(&priv->stats.rx_pkt_cnt, count);
+
+ ret = phy_read_mmd(phydev, MDIO_MMD_VEND2, DP83TD510E_PKT_STAT_6);
+ if (ret < 0)
+ return ret;
+ /* rx_err_pkt_cnt */
+ ethtool_stat_add(&priv->stats.rx_err_pkt_cnt, ret);
+
+ return 0;
+}
+
+static void dp83td510_get_phy_stats(struct phy_device *phydev,
+ struct ethtool_eth_phy_stats *eth_stats,
+ struct ethtool_phy_stats *stats)
+{
+ struct dp83td510_priv *priv = phydev->priv;
+
+ stats->tx_packets = priv->stats.tx_pkt_cnt;
+ stats->tx_errors = priv->stats.tx_err_pkt_cnt;
+ stats->rx_packets = priv->stats.rx_pkt_cnt;
+ stats->rx_errors = priv->stats.rx_err_pkt_cnt;
+}
+
static int dp83td510_config_intr(struct phy_device *phydev)
{
int ret;
@@ -599,6 +709,8 @@ static struct phy_driver dp83td510_driver[] = {
.get_sqi_max = dp83td510_get_sqi_max,
.cable_test_start = dp83td510_cable_test_start,
.cable_test_get_status = dp83td510_cable_test_get_status,
+ .get_phy_stats = dp83td510_get_phy_stats,
+ .update_stats = dp83td510_update_stats,
.suspend = genphy_suspend,
.resume = genphy_resume,
--
2.39.5
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