[PATCH] net: qcom/emac: add ethtool support

[Timur Tabi <timur@codeaurora.org>]

Add support for some ethtool methods: get/set link settings, get/set
message level, get statistics, get link status, and restart
autonegotiation.

Signed-off-by: Timur Tabi <timur@codeaurora.org>
---
 drivers/net/ethernet/qualcomm/emac/Makefile       |   2 +-
 drivers/net/ethernet/qualcomm/emac/emac-ethtool.c | 156 ++++++++++++++++++++++
 drivers/net/ethernet/qualcomm/emac/emac.c         |  51 ++++---
 drivers/net/ethernet/qualcomm/emac/emac.h         |   3 +
 4 files changed, 191 insertions(+), 21 deletions(-)
 create mode 100644 drivers/net/ethernet/qualcomm/emac/emac-ethtool.c

diff --git a/drivers/net/ethernet/qualcomm/emac/Makefile b/drivers/net/ethernet/qualcomm/emac/Makefile
index 7a66879..fc57ced 100644
--- a/drivers/net/ethernet/qualcomm/emac/Makefile
+++ b/drivers/net/ethernet/qualcomm/emac/Makefile
@@ -4,6 +4,6 @@
 
 obj-$(CONFIG_QCOM_EMAC) += qcom-emac.o
 
-qcom-emac-objs := emac.o emac-mac.o emac-phy.o emac-sgmii.o \
+qcom-emac-objs := emac.o emac-mac.o emac-phy.o emac-sgmii.o emac-ethtool.o \
 		  emac-sgmii-fsm9900.o emac-sgmii-qdf2432.o \
 		  emac-sgmii-qdf2400.o
diff --git a/drivers/net/ethernet/qualcomm/emac/emac-ethtool.c b/drivers/net/ethernet/qualcomm/emac/emac-ethtool.c
new file mode 100644
index 0000000..6de5152
--- /dev/null
+++ b/drivers/net/ethernet/qualcomm/emac/emac-ethtool.c
@@ -0,0 +1,156 @@
+/* Copyright (c) 2016, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/ethtool.h>
+#include <linux/phy.h>
+
+#include "emac.h"
+
+static const char * const emac_ethtool_stat_strings[] = {
+	"rx_ok",
+	"rx_bcast",
+	"rx_mcast",
+	"rx_pause",
+	"rx_ctrl",
+	"rx_fcs_err",
+	"rx_len_err",
+	"rx_byte_cnt",
+	"rx_runt",
+	"rx_frag",
+	"rx_sz_64",
+	"rx_sz_65_127",
+	"rx_sz_128_255",
+	"rx_sz_256_511",
+	"rx_sz_512_1023",
+	"rx_sz_1024_1518",
+	"rx_sz_1519_max",
+	"rx_sz_ov",
+	"rx_rxf_ov",
+	"rx_align_err",
+	"rx_bcast_byte_cnt",
+	"rx_mcast_byte_cnt",
+	"rx_err_addr",
+	"rx_crc_align",
+	"rx_jabbers",
+	"tx_ok",
+	"tx_bcast",
+	"tx_mcast",
+	"tx_pause",
+	"tx_exc_defer",
+	"tx_ctrl",
+	"tx_defer",
+	"tx_byte_cnt",
+	"tx_sz_64",
+	"tx_sz_65_127",
+	"tx_sz_128_255",
+	"tx_sz_256_511",
+	"tx_sz_512_1023",
+	"tx_sz_1024_1518",
+	"tx_sz_1519_max",
+	"tx_1_col",
+	"tx_2_col",
+	"tx_late_col",
+	"tx_abort_col",
+	"tx_underrun",
+	"tx_rd_eop",
+	"tx_len_err",
+	"tx_trunc",
+	"tx_bcast_byte",
+	"tx_mcast_byte",
+	"tx_col",
+};
+
+#define EMAC_STATS_LEN	ARRAY_SIZE(emac_ethtool_stat_strings)
+
+static u32 emac_get_msglevel(struct net_device *netdev)
+{
+	struct emac_adapter *adpt = netdev_priv(netdev);
+
+	return adpt->msg_enable;
+}
+
+static void emac_set_msglevel(struct net_device *netdev, u32 data)
+{
+	struct emac_adapter *adpt = netdev_priv(netdev);
+
+	adpt->msg_enable = data;
+}
+
+static int emac_get_sset_count(struct net_device *netdev, int sset)
+{
+	switch (sset) {
+	case ETH_SS_STATS:
+		return EMAC_STATS_LEN;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static void emac_get_strings(struct net_device *netdev, u32 stringset, u8 *data)
+{
+	unsigned int i;
+
+	switch (stringset) {
+	case ETH_SS_STATS:
+		for (i = 0; i < EMAC_STATS_LEN; i++) {
+			strlcpy(data, emac_ethtool_stat_strings[i],
+				ETH_GSTRING_LEN);
+			data += ETH_GSTRING_LEN;
+		}
+		break;
+	}
+}
+
+static void emac_get_ethtool_stats(struct net_device *netdev,
+				   struct ethtool_stats *stats,
+				   u64 *data)
+{
+	struct emac_adapter *adpt = netdev_priv(netdev);
+
+	spin_lock(&adpt->stats.lock);
+
+	emac_update_hw_stats(adpt);
+	memcpy(data, &adpt->stats, EMAC_STATS_LEN * sizeof(u64));
+
+	spin_unlock(&adpt->stats.lock);
+}
+
+static int emac_nway_reset(struct net_device *netdev)
+{
+	struct phy_device *phydev = netdev->phydev;
+
+	if (!phydev)
+		return -ENODEV;
+
+	return genphy_restart_aneg(phydev);
+}
+
+static const struct ethtool_ops emac_ethtool_ops = {
+	.get_link_ksettings = phy_ethtool_get_link_ksettings,
+	.set_link_ksettings = phy_ethtool_set_link_ksettings,
+
+	.get_msglevel    = emac_get_msglevel,
+	.set_msglevel    = emac_set_msglevel,
+
+	.get_sset_count  = emac_get_sset_count,
+	.get_strings = emac_get_strings,
+	.get_ethtool_stats = emac_get_ethtool_stats,
+
+	.nway_reset = emac_nway_reset,
+
+	.get_link = ethtool_op_get_link,
+};
+
+void emac_set_ethtool_ops(struct net_device *netdev)
+{
+	netdev->ethtool_ops = &emac_ethtool_ops;
+}
diff --git a/drivers/net/ethernet/qualcomm/emac/emac.c b/drivers/net/ethernet/qualcomm/emac/emac.c
index 422289c..1ab4478 100644
--- a/drivers/net/ethernet/qualcomm/emac/emac.c
+++ b/drivers/net/ethernet/qualcomm/emac/emac.c
@@ -311,45 +311,55 @@ static int emac_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
 	return phy_mii_ioctl(netdev->phydev, ifr, cmd);
 }
 
-/* Provide network statistics info for the interface */
-static struct rtnl_link_stats64 *emac_get_stats64(struct net_device *netdev,
-						  struct rtnl_link_stats64 *net_stats)
+/**
+ * emac_update_hw_stats - read the EMAC stat registers
+ *
+ * Reads the stats registers and write the values to adpt->stats.
+ *
+ * adpt->stats.lock must be held while calling this function.
+ */
+void emac_update_hw_stats(struct emac_adapter *adpt)
 {
-	struct emac_adapter *adpt = netdev_priv(netdev);
-	unsigned int addr = REG_MAC_RX_STATUS_BIN;
 	struct emac_stats *stats = &adpt->stats;
 	u64 *stats_itr = &adpt->stats.rx_ok;
-	u32 val;
-
-	spin_lock(&stats->lock);
+	void __iomem *base = adpt->base;
+	unsigned int addr;
 
+	addr = REG_MAC_RX_STATUS_BIN;
 	while (addr <= REG_MAC_RX_STATUS_END) {
-		val = readl_relaxed(adpt->base + addr);
-		*stats_itr += val;
+		*stats_itr += readl_relaxed(base + addr);
 		stats_itr++;
 		addr += sizeof(u32);
 	}
 
 	/* additional rx status */
-	val = readl_relaxed(adpt->base + EMAC_RXMAC_STATC_REG23);
-	adpt->stats.rx_crc_align += val;
-	val = readl_relaxed(adpt->base + EMAC_RXMAC_STATC_REG24);
-	adpt->stats.rx_jabbers += val;
+	stats->rx_crc_align += readl_relaxed(base + EMAC_RXMAC_STATC_REG23);
+	stats->rx_jabbers += readl_relaxed(base + EMAC_RXMAC_STATC_REG24);
 
 	/* update tx status */
 	addr = REG_MAC_TX_STATUS_BIN;
-	stats_itr = &adpt->stats.tx_ok;
+	stats_itr = &stats->tx_ok;
 
 	while (addr <= REG_MAC_TX_STATUS_END) {
-		val = readl_relaxed(adpt->base + addr);
-		*stats_itr += val;
-		++stats_itr;
+		*stats_itr += readl_relaxed(base + addr);
+		stats_itr++;
 		addr += sizeof(u32);
 	}
 
 	/* additional tx status */
-	val = readl_relaxed(adpt->base + EMAC_TXMAC_STATC_REG25);
-	adpt->stats.tx_col += val;
+	stats->tx_col += readl_relaxed(base + EMAC_TXMAC_STATC_REG25);
+}
+
+/* Provide network statistics info for the interface */
+static struct rtnl_link_stats64 *
+emac_get_stats64(struct net_device *netdev, struct rtnl_link_stats64 *net_stats)
+{
+	struct emac_adapter *adpt = netdev_priv(netdev);
+	struct emac_stats *stats = &adpt->stats;
+
+	spin_lock(&stats->lock);
+
+	emac_update_hw_stats(adpt);
 
 	/* return parsed statistics */
 	net_stats->rx_packets = stats->rx_ok;
@@ -620,6 +630,7 @@ static int emac_probe(struct platform_device *pdev)
 
 	dev_set_drvdata(&pdev->dev, netdev);
 	SET_NETDEV_DEV(netdev, &pdev->dev);
+	emac_set_ethtool_ops(netdev);
 
 	adpt = netdev_priv(netdev);
 	adpt->netdev = netdev;
diff --git a/drivers/net/ethernet/qualcomm/emac/emac.h b/drivers/net/ethernet/qualcomm/emac/emac.h
index 0c76e6c..4b8483c 100644
--- a/drivers/net/ethernet/qualcomm/emac/emac.h
+++ b/drivers/net/ethernet/qualcomm/emac/emac.h
@@ -332,4 +332,7 @@ struct emac_adapter {
 void emac_reg_update32(void __iomem *addr, u32 mask, u32 val);
 irqreturn_t emac_isr(int irq, void *data);
 
+void emac_set_ethtool_ops(struct net_device *netdev);
+void emac_update_hw_stats(struct emac_adapter *adpt);
+
 #endif /* _EMAC_H_ */
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm
Technologies, Inc.  Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.