staging: fsl-dpaa2/ethsw: Add ethtool support

Add driver information, link details and hardware statistics to be
reported via ethtool -S.

Signed-off-by: Razvan Stefanescu <razvan.stefanescu@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fsl-dpaa2/ethsw/Makefile

@@ -7,4 +7,4 @@
 
 obj-$(CONFIG_FSL_DPAA2_ETHSW) += dpaa2-ethsw.o
 
-dpaa2-ethsw-objs := ethsw.o dpsw.o
+dpaa2-ethsw-objs := ethsw.o ethsw-ethtool.o dpsw.o

drivers/staging/fsl-dpaa2/ethsw/dpsw-cmd.h

@@ -49,6 +49,8 @@
 #define DPSW_CMDID_IF_SET_FLOODING          DPSW_CMD_ID(0x047)
 #define DPSW_CMDID_IF_SET_BROADCAST         DPSW_CMD_ID(0x048)
 
+#define DPSW_CMDID_IF_SET_LINK_CFG          DPSW_CMD_ID(0x04C)
+
 #define DPSW_CMDID_VLAN_ADD                 DPSW_CMD_ID(0x060)
 #define DPSW_CMDID_VLAN_ADD_IF              DPSW_CMD_ID(0x061)
 #define DPSW_CMDID_VLAN_ADD_IF_UNTAGGED     DPSW_CMD_ID(0x062)
@@ -237,6 +239,17 @@ struct dpsw_cmd_if_set_max_frame_length {
 	__le16 frame_length;
 };
 
+struct dpsw_cmd_if_set_link_cfg {
+	/* cmd word 0 */
+	__le16 if_id;
+	u8 pad[6];
+	/* cmd word 1 */
+	__le32 rate;
+	__le32 pad1;
+	/* cmd word 2 */
+	__le64 options;
+};
+
 struct dpsw_cmd_if_get_link_state {
 	__le16 if_id;
 };

drivers/staging/fsl-dpaa2/ethsw/dpsw.c

@@ -357,6 +357,38 @@ int dpsw_get_attributes(struct fsl_mc_io *mc_io,
 	return 0;
 }
 
+/**
+ * dpsw_if_set_link_cfg() - Set the link configuration.
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPSW object
+ * @if_id:	Interface id
+ * @cfg:	Link configuration
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dpsw_if_set_link_cfg(struct fsl_mc_io *mc_io,
+			 u32 cmd_flags,
+			 u16 token,
+			 u16 if_id,
+			 struct dpsw_link_cfg *cfg)
+{
+	struct mc_command cmd = { 0 };
+	struct dpsw_cmd_if_set_link_cfg *cmd_params;
+
+	/* prepare command */
+	cmd.header = mc_encode_cmd_header(DPSW_CMDID_IF_SET_LINK_CFG,
+					  cmd_flags,
+					  token);
+	cmd_params = (struct dpsw_cmd_if_set_link_cfg *)cmd.params;
+	cmd_params->if_id = cpu_to_le16(if_id);
+	cmd_params->rate = cpu_to_le32(cfg->rate);
+	cmd_params->options = cpu_to_le64(cfg->options);
+
+	/* send command to mc*/
+	return mc_send_command(mc_io, &cmd);
+}
+
 /**
  * dpsw_if_get_link_state - Return the link state
  * @mc_io:	Pointer to MC portal's I/O object

drivers/staging/fsl-dpaa2/ethsw/dpsw.h

@@ -219,6 +219,38 @@ enum dpsw_action {
 	DPSW_ACTION_REDIRECT = 1
 };
 
+/**
+ * Enable auto-negotiation
+ */
+#define DPSW_LINK_OPT_AUTONEG		0x0000000000000001ULL
+/**
+ * Enable half-duplex mode
+ */
+#define DPSW_LINK_OPT_HALF_DUPLEX	0x0000000000000002ULL
+/**
+ * Enable pause frames
+ */
+#define DPSW_LINK_OPT_PAUSE		0x0000000000000004ULL
+/**
+ * Enable a-symmetric pause frames
+ */
+#define DPSW_LINK_OPT_ASYM_PAUSE	0x0000000000000008ULL
+
+/**
+ * struct dpsw_link_cfg - Structure representing DPSW link configuration
+ * @rate: Rate
+ * @options: Mask of available options; use 'DPSW_LINK_OPT_<X>' values
+ */
+struct dpsw_link_cfg {
+	u32 rate;
+	u64 options;
+};
+
+int dpsw_if_set_link_cfg(struct fsl_mc_io *mc_io,
+			 u32 cmd_flags,
+			 u16 token,
+			 u16 if_id,
+			 struct dpsw_link_cfg *cfg);
 /**
  * struct dpsw_link_state - Structure representing DPSW link state
  * @rate: Rate

drivers/staging/fsl-dpaa2/ethsw/ethsw-ethtool.c

@@ -0,0 +1,182 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * DPAA2 Ethernet Switch ethtool support
+ *
+ * Copyright 2014-2016 Freescale Semiconductor Inc.
+ * Copyright 2017-2018 NXP
+ *
+ */
+
+#include "ethsw.h"
+
+static struct {
+	enum dpsw_counter id;
+	char name[ETH_GSTRING_LEN];
+} ethsw_ethtool_counters[] =  {
+	{DPSW_CNT_ING_FRAME,		"rx frames"},
+	{DPSW_CNT_ING_BYTE,		"rx bytes"},
+	{DPSW_CNT_ING_FLTR_FRAME,	"rx filtered frames"},
+	{DPSW_CNT_ING_FRAME_DISCARD,	"rx discarded frames"},
+	{DPSW_CNT_ING_BCAST_FRAME,	"rx b-cast frames"},
+	{DPSW_CNT_ING_BCAST_BYTES,	"rx b-cast bytes"},
+	{DPSW_CNT_ING_MCAST_FRAME,	"rx m-cast frames"},
+	{DPSW_CNT_ING_MCAST_BYTE,	"rx m-cast bytes"},
+	{DPSW_CNT_EGR_FRAME,		"tx frames"},
+	{DPSW_CNT_EGR_BYTE,		"tx bytes"},
+	{DPSW_CNT_EGR_FRAME_DISCARD,	"tx discarded frames"},
+
+};
+
+#define ETHSW_NUM_COUNTERS	ARRAY_SIZE(ethsw_ethtool_counters)
+
+static void ethsw_get_drvinfo(struct net_device *netdev,
+			      struct ethtool_drvinfo *drvinfo)
+{
+	struct ethsw_port_priv *port_priv = netdev_priv(netdev);
+	u16 version_major, version_minor;
+	int err;
+
+	strlcpy(drvinfo->driver, KBUILD_MODNAME, sizeof(drvinfo->driver));
+
+	err = dpsw_get_api_version(port_priv->ethsw_data->mc_io, 0,
+				   &version_major,
+				   &version_minor);
+	if (err)
+		strlcpy(drvinfo->fw_version, "N/A",
+			sizeof(drvinfo->fw_version));
+	else
+		snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version),
+			 "%u.%u", version_major, version_minor);
+
+	strlcpy(drvinfo->bus_info, dev_name(netdev->dev.parent->parent),
+		sizeof(drvinfo->bus_info));
+}
+
+static int
+ethsw_get_link_ksettings(struct net_device *netdev,
+			 struct ethtool_link_ksettings *link_ksettings)
+{
+	struct ethsw_port_priv *port_priv = netdev_priv(netdev);
+	struct dpsw_link_state state = {0};
+	int err = 0;
+
+	err = dpsw_if_get_link_state(port_priv->ethsw_data->mc_io, 0,
+				     port_priv->ethsw_data->dpsw_handle,
+				     port_priv->idx,
+				     &state);
+	if (err) {
+		netdev_err(netdev, "ERROR %d getting link state", err);
+		goto out;
+	}
+
+	/* At the moment, we have no way of interrogating the DPMAC
+	 * from the DPSW side or there may not exist a DPMAC at all.
+	 * Report only autoneg state, duplexity and speed.
+	 */
+	if (state.options & DPSW_LINK_OPT_AUTONEG)
+		link_ksettings->base.autoneg = AUTONEG_ENABLE;
+	if (!(state.options & DPSW_LINK_OPT_HALF_DUPLEX))
+		link_ksettings->base.duplex = DUPLEX_FULL;
+	link_ksettings->base.speed = state.rate;
+
+out:
+	return err;
+}
+
+static int
+ethsw_set_link_ksettings(struct net_device *netdev,
+			 const struct ethtool_link_ksettings *link_ksettings)
+{
+	struct ethsw_port_priv *port_priv = netdev_priv(netdev);
+	struct dpsw_link_cfg cfg = {0};
+	int err = 0;
+
+	netdev_dbg(netdev, "Setting link parameters...");
+
+	/* Due to a temporary MC limitation, the DPSW port must be down
+	 * in order to be able to change link settings. Taking steps to let
+	 * the user know that.
+	 */
+	if (netif_running(netdev)) {
+		netdev_info(netdev, "Sorry, interface must be brought down first.\n");
+		return -EACCES;
+	}
+
+	cfg.rate = link_ksettings->base.speed;
+	if (link_ksettings->base.autoneg == AUTONEG_ENABLE)
+		cfg.options |= DPSW_LINK_OPT_AUTONEG;
+	else
+		cfg.options &= ~DPSW_LINK_OPT_AUTONEG;
+	if (link_ksettings->base.duplex  == DUPLEX_HALF)
+		cfg.options |= DPSW_LINK_OPT_HALF_DUPLEX;
+	else
+		cfg.options &= ~DPSW_LINK_OPT_HALF_DUPLEX;
+
+	err = dpsw_if_set_link_cfg(port_priv->ethsw_data->mc_io, 0,
+				   port_priv->ethsw_data->dpsw_handle,
+				   port_priv->idx,
+				   &cfg);
+	if (err)
+		/* ethtool will be loud enough if we return an error; no point
+		 * in putting our own error message on the console by default
+		 */
+		netdev_dbg(netdev, "ERROR %d setting link cfg", err);
+
+	return err;
+}
+
+static int ethsw_ethtool_get_sset_count(struct net_device *dev, int sset)
+{
+	switch (sset) {
+	case ETH_SS_STATS:
+		return ETHSW_NUM_COUNTERS;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static void ethsw_ethtool_get_strings(struct net_device *netdev,
+				      u32 stringset, u8 *data)
+{
+	int i;
+
+	switch (stringset) {
+	case ETH_SS_STATS:
+		for (i = 0; i < ETHSW_NUM_COUNTERS; i++)
+			memcpy(data + i * ETH_GSTRING_LEN,
+			       ethsw_ethtool_counters[i].name, ETH_GSTRING_LEN);
+		break;
+	}
+}
+
+static void ethsw_ethtool_get_stats(struct net_device *netdev,
+				    struct ethtool_stats *stats,
+				    u64 *data)
+{
+	struct ethsw_port_priv *port_priv = netdev_priv(netdev);
+	int i, err;
+
+	memset(data, 0,
+	       sizeof(u64) * ETHSW_NUM_COUNTERS);
+
+	for (i = 0; i < ETHSW_NUM_COUNTERS; i++) {
+		err = dpsw_if_get_counter(port_priv->ethsw_data->mc_io, 0,
+					  port_priv->ethsw_data->dpsw_handle,
+					  port_priv->idx,
+					  ethsw_ethtool_counters[i].id,
+					  &data[i]);
+		if (err)
+			netdev_err(netdev, "dpsw_if_get_counter[%s] err %d\n",
+				   ethsw_ethtool_counters[i].name, err);
+	}
+}
+
+const struct ethtool_ops ethsw_port_ethtool_ops = {
+	.get_drvinfo		= ethsw_get_drvinfo,
+	.get_link		= ethtool_op_get_link,
+	.get_link_ksettings	= ethsw_get_link_ksettings,
+	.set_link_ksettings	= ethsw_set_link_ksettings,
+	.get_strings		= ethsw_ethtool_get_strings,
+	.get_ethtool_stats	= ethsw_ethtool_get_stats,
+	.get_sset_count		= ethsw_ethtool_get_sset_count,
+};

drivers/staging/fsl-dpaa2/ethsw/ethsw.c

@@ -1376,6 +1376,7 @@ static int ethsw_probe_port(struct ethsw_core *ethsw, u16 port_idx)
 
 	SET_NETDEV_DEV(port_netdev, dev);
 	port_netdev->netdev_ops = &ethsw_port_ops;
+	port_netdev->ethtool_ops = &ethsw_port_ethtool_ops;
 	port_netdev->switchdev_ops = &ethsw_port_switchdev_ops;
 
 	/* Set MTU limits */

drivers/staging/fsl-dpaa2/ethsw/ethsw.h

@@ -33,6 +33,8 @@
 #define ETHSW_MAX_FRAME_LENGTH	(DPAA2_MFL - VLAN_ETH_HLEN - ETH_FCS_LEN)
 #define ETHSW_L2_MAX_FRM(mtu)	((mtu) + VLAN_ETH_HLEN + ETH_FCS_LEN)
 
+extern const struct ethtool_ops ethsw_port_ethtool_ops;
+
 struct ethsw_core;
 
 /* Per port private data */