1 files changed, 226 insertions, 29 deletions

diff --git a/drivers/leds/trigger/ledtrig-netdev.c b/drivers/leds/trigger/ledtrig-netdev.c
index 92de22be5f1c..c9bc5a91ec83 100644
--- a/drivers/leds/trigger/ledtrig-netdev.c
+++ b/drivers/leds/trigger/ledtrig-netdev.c
@@ -13,6 +13,7 @@
 #include <linux/atomic.h>
 #include <linux/ctype.h>
 #include <linux/device.h>
+#include <linux/ethtool.h>
 #include <linux/init.h>
 #include <linux/jiffies.h>
 #include <linux/kernel.h>
@@ -21,9 +22,12 @@
 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/mutex.h>
+#include <linux/rtnetlink.h>
 #include <linux/timer.h>
 #include "../leds.h"
 
+#define NETDEV_LED_DEFAULT_INTERVAL	50
+
 /*
  * Configurable sysfs attributes:
  *
@@ -50,16 +54,11 @@ struct led_netdev_data {
 	unsigned int last_activity;
 
 	unsigned long mode;
-	bool carrier_link_up;
-};
+	int link_speed;
+	u8 duplex;
 
-enum led_trigger_netdev_modes {
-	TRIGGER_NETDEV_LINK = 0,
-	TRIGGER_NETDEV_TX,
-	TRIGGER_NETDEV_RX,
-
-	/* Keep last */
-	__TRIGGER_NETDEV_MAX,
+	bool carrier_link_up;
+	bool hw_control;
 };
 
 static void set_baseline_state(struct led_netdev_data *trigger_data)
@@ -67,6 +66,13 @@ static void set_baseline_state(struct led_netdev_data *trigger_data)
 	int current_brightness;
 	struct led_classdev *led_cdev = trigger_data->led_cdev;
 
+	/* Already validated, hw control is possible with the requested mode */
+	if (trigger_data->hw_control) {
+		led_cdev->hw_control_set(led_cdev, trigger_data->mode);
+
+		return;
+	}
+
 	current_brightness = led_cdev->brightness;
 	if (current_brightness)
 		led_cdev->blink_brightness = current_brightness;
@@ -76,7 +82,32 @@ static void set_baseline_state(struct led_netdev_data *trigger_data)
 	if (!trigger_data->carrier_link_up) {
 		led_set_brightness(led_cdev, LED_OFF);
 	} else {
+		bool blink_on = false;
+
 		if (test_bit(TRIGGER_NETDEV_LINK, &trigger_data->mode))
+			blink_on = true;
+
+		if (test_bit(TRIGGER_NETDEV_LINK_10, &trigger_data->mode) &&
+		    trigger_data->link_speed == SPEED_10)
+			blink_on = true;
+
+		if (test_bit(TRIGGER_NETDEV_LINK_100, &trigger_data->mode) &&
+		    trigger_data->link_speed == SPEED_100)
+			blink_on = true;
+
+		if (test_bit(TRIGGER_NETDEV_LINK_1000, &trigger_data->mode) &&
+		    trigger_data->link_speed == SPEED_1000)
+			blink_on = true;
+
+		if (test_bit(TRIGGER_NETDEV_HALF_DUPLEX, &trigger_data->mode) &&
+		    trigger_data->duplex == DUPLEX_HALF)
+			blink_on = true;
+
+		if (test_bit(TRIGGER_NETDEV_FULL_DUPLEX, &trigger_data->mode) &&
+		    trigger_data->duplex == DUPLEX_FULL)
+			blink_on = true;
+
+		if (blink_on)
 			led_set_brightness(led_cdev,
 					   led_cdev->blink_brightness);
 		else
@@ -91,6 +122,89 @@ static void set_baseline_state(struct led_netdev_data *trigger_data)
 	}
 }
 
+static bool supports_hw_control(struct led_classdev *led_cdev)
+{
+	if (!led_cdev->hw_control_get || !led_cdev->hw_control_set ||
+	    !led_cdev->hw_control_is_supported)
+		return false;
+
+	return !strcmp(led_cdev->hw_control_trigger, led_cdev->trigger->name);
+}
+
+/*
+ * Validate the configured netdev is the same as the one associated with
+ * the LED driver in hw control.
+ */
+static bool validate_net_dev(struct led_classdev *led_cdev,
+			     struct net_device *net_dev)
+{
+	struct device *dev = led_cdev->hw_control_get_device(led_cdev);
+	struct net_device *ndev;
+
+	if (!dev)
+		return false;
+
+	ndev = to_net_dev(dev);
+
+	return ndev == net_dev;
+}
+
+static bool can_hw_control(struct led_netdev_data *trigger_data)
+{
+	unsigned long default_interval = msecs_to_jiffies(NETDEV_LED_DEFAULT_INTERVAL);
+	unsigned int interval = atomic_read(&trigger_data->interval);
+	struct led_classdev *led_cdev = trigger_data->led_cdev;
+	int ret;
+
+	if (!supports_hw_control(led_cdev))
+		return false;
+
+	/*
+	 * Interval must be set to the default
+	 * value. Any different value is rejected if in hw
+	 * control.
+	 */
+	if (interval != default_interval)
+		return false;
+
+	/*
+	 * net_dev must be set with hw control, otherwise no
+	 * blinking can be happening and there is nothing to
+	 * offloaded. Additionally, for hw control to be
+	 * valid, the configured netdev must be the same as
+	 * netdev associated to the LED.
+	 */
+	if (!validate_net_dev(led_cdev, trigger_data->net_dev))
+		return false;
+
+	/* Check if the requested mode is supported */
+	ret = led_cdev->hw_control_is_supported(led_cdev, trigger_data->mode);
+	/* Fall back to software blinking if not supported */
+	if (ret == -EOPNOTSUPP)
+		return false;
+	if (ret) {
+		dev_warn(led_cdev->dev,
+			 "Current mode check failed with error %d\n", ret);
+		return false;
+	}
+
+	return true;
+}
+
+static void get_device_state(struct led_netdev_data *trigger_data)
+{
+	struct ethtool_link_ksettings cmd;
+
+	trigger_data->carrier_link_up = netif_carrier_ok(trigger_data->net_dev);
+	if (!trigger_data->carrier_link_up)
+		return;
+
+	if (!__ethtool_get_link_ksettings(trigger_data->net_dev, &cmd)) {
+		trigger_data->link_speed = cmd.base.speed;
+		trigger_data->duplex = cmd.base.duplex;
+	}
+}
+
 static ssize_t device_name_show(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {
@@ -104,15 +218,9 @@ static ssize_t device_name_show(struct device *dev,
 	return len;
 }
 
-static ssize_t device_name_store(struct device *dev,
-				 struct device_attribute *attr, const char *buf,
-				 size_t size)
+static int set_device_name(struct led_netdev_data *trigger_data,
+			   const char *name, size_t size)
 {
-	struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
-
-	if (size >= IFNAMSIZ)
-		return -EINVAL;
-
 	cancel_delayed_work_sync(&trigger_data->work);
 
 	mutex_lock(&trigger_data->lock);
@@ -122,7 +230,7 @@ static ssize_t device_name_store(struct device *dev,
 		trigger_data->net_dev = NULL;
 	}
 
-	memcpy(trigger_data->device_name, buf, size);
+	memcpy(trigger_data->device_name, name, size);
 	trigger_data->device_name[size] = 0;
 	if (size > 0 && trigger_data->device_name[size - 1] == '\n')
 		trigger_data->device_name[size - 1] = 0;
@@ -132,14 +240,36 @@ static ssize_t device_name_store(struct device *dev,
 		    dev_get_by_name(&init_net, trigger_data->device_name);
 
 	trigger_data->carrier_link_up = false;
-	if (trigger_data->net_dev != NULL)
-		trigger_data->carrier_link_up = netif_carrier_ok(trigger_data->net_dev);
+	trigger_data->link_speed = SPEED_UNKNOWN;
+	trigger_data->duplex = DUPLEX_UNKNOWN;
+	if (trigger_data->net_dev != NULL) {
+		rtnl_lock();
+		get_device_state(trigger_data);
+		rtnl_unlock();
+	}
 
 	trigger_data->last_activity = 0;
 
 	set_baseline_state(trigger_data);
 	mutex_unlock(&trigger_data->lock);
 
+	return 0;
+}
+
+static ssize_t device_name_store(struct device *dev,
+				 struct device_attribute *attr, const char *buf,
+				 size_t size)
+{
+	struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
+	int ret;
+
+	if (size >= IFNAMSIZ)
+		return -EINVAL;
+
+	ret = set_device_name(trigger_data, buf, size);
+
+	if (ret < 0)
+		return ret;
 	return size;
 }
 
@@ -153,6 +283,11 @@ static ssize_t netdev_led_attr_show(struct device *dev, char *buf,
 
 	switch (attr) {
 	case TRIGGER_NETDEV_LINK:
+	case TRIGGER_NETDEV_LINK_10:
+	case TRIGGER_NETDEV_LINK_100:
+	case TRIGGER_NETDEV_LINK_1000:
+	case TRIGGER_NETDEV_HALF_DUPLEX:
+	case TRIGGER_NETDEV_FULL_DUPLEX:
 	case TRIGGER_NETDEV_TX:
 	case TRIGGER_NETDEV_RX:
 		bit = attr;
@@ -168,7 +303,7 @@ static ssize_t netdev_led_attr_store(struct device *dev, const char *buf,
 				     size_t size, enum led_trigger_netdev_modes attr)
 {
 	struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
-	unsigned long state;
+	unsigned long state, mode = trigger_data->mode;
 	int ret;
 	int bit;
 
@@ -178,6 +313,11 @@ static ssize_t netdev_led_attr_store(struct device *dev, const char *buf,
 
 	switch (attr) {
 	case TRIGGER_NETDEV_LINK:
+	case TRIGGER_NETDEV_LINK_10:
+	case TRIGGER_NETDEV_LINK_100:
+	case TRIGGER_NETDEV_LINK_1000:
+	case TRIGGER_NETDEV_HALF_DUPLEX:
+	case TRIGGER_NETDEV_FULL_DUPLEX:
 	case TRIGGER_NETDEV_TX:
 	case TRIGGER_NETDEV_RX:
 		bit = attr;
@@ -186,12 +326,21 @@ static ssize_t netdev_led_attr_store(struct device *dev, const char *buf,
 		return -EINVAL;
 	}
 
-	cancel_delayed_work_sync(&trigger_data->work);
-
 	if (state)
-		set_bit(bit, &trigger_data->mode);
+		set_bit(bit, &mode);
 	else
-		clear_bit(bit, &trigger_data->mode);
+		clear_bit(bit, &mode);
+
+	if (test_bit(TRIGGER_NETDEV_LINK, &mode) &&
+	    (test_bit(TRIGGER_NETDEV_LINK_10, &mode) ||
+	     test_bit(TRIGGER_NETDEV_LINK_100, &mode) ||
+	     test_bit(TRIGGER_NETDEV_LINK_1000, &mode)))
+		return -EINVAL;
+
+	cancel_delayed_work_sync(&trigger_data->work);
+
+	trigger_data->mode = mode;
+	trigger_data->hw_control = can_hw_control(trigger_data);
 
 	set_baseline_state(trigger_data);
 
@@ -212,6 +361,11 @@ static ssize_t netdev_led_attr_store(struct device *dev, const char *buf,
 	static DEVICE_ATTR_RW(trigger_name)
 
 DEFINE_NETDEV_TRIGGER(link, TRIGGER_NETDEV_LINK);
+DEFINE_NETDEV_TRIGGER(link_10, TRIGGER_NETDEV_LINK_10);
+DEFINE_NETDEV_TRIGGER(link_100, TRIGGER_NETDEV_LINK_100);
+DEFINE_NETDEV_TRIGGER(link_1000, TRIGGER_NETDEV_LINK_1000);
+DEFINE_NETDEV_TRIGGER(half_duplex, TRIGGER_NETDEV_HALF_DUPLEX);
+DEFINE_NETDEV_TRIGGER(full_duplex, TRIGGER_NETDEV_FULL_DUPLEX);
 DEFINE_NETDEV_TRIGGER(tx, TRIGGER_NETDEV_TX);
 DEFINE_NETDEV_TRIGGER(rx, TRIGGER_NETDEV_RX);
 
@@ -232,6 +386,9 @@ static ssize_t interval_store(struct device *dev,
 	unsigned long value;
 	int ret;
 
+	if (trigger_data->hw_control)
+		return -EINVAL;
+
 	ret = kstrtoul(buf, 0, &value);
 	if (ret)
 		return ret;
@@ -249,12 +406,28 @@ static ssize_t interval_store(struct device *dev,
 
 static DEVICE_ATTR_RW(interval);
 
+static ssize_t hw_control_show(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
+
+	return sprintf(buf, "%d\n", trigger_data->hw_control);
+}
+
+static DEVICE_ATTR_RO(hw_control);
+
 static struct attribute *netdev_trig_attrs[] = {
 	&dev_attr_device_name.attr,
 	&dev_attr_link.attr,
+	&dev_attr_link_10.attr,
+	&dev_attr_link_100.attr,
+	&dev_attr_link_1000.attr,
+	&dev_attr_full_duplex.attr,
+	&dev_attr_half_duplex.attr,
 	&dev_attr_rx.attr,
 	&dev_attr_tx.attr,
 	&dev_attr_interval.attr,
+	&dev_attr_hw_control.attr,
 	NULL
 };
 ATTRIBUTE_GROUPS(netdev_trig);
@@ -282,9 +455,11 @@ static int netdev_trig_notify(struct notifier_block *nb,
 	mutex_lock(&trigger_data->lock);
 
 	trigger_data->carrier_link_up = false;
+	trigger_data->link_speed = SPEED_UNKNOWN;
+	trigger_data->duplex = DUPLEX_UNKNOWN;
 	switch (evt) {
 	case NETDEV_CHANGENAME:
-		trigger_data->carrier_link_up = netif_carrier_ok(dev);
+		get_device_state(trigger_data);
 		fallthrough;
 	case NETDEV_REGISTER:
 		dev_put(trigger_data->net_dev);
@@ -297,7 +472,7 @@ static int netdev_trig_notify(struct notifier_block *nb,
 		break;
 	case NETDEV_UP:
 	case NETDEV_CHANGE:
-		trigger_data->carrier_link_up = netif_carrier_ok(dev);
+		get_device_state(trigger_data);
 		break;
 	}
 
@@ -340,7 +515,12 @@ static void netdev_trig_work(struct work_struct *work)
 	if (trigger_data->last_activity != new_activity) {
 		led_stop_software_blink(trigger_data->led_cdev);
 
-		invert = test_bit(TRIGGER_NETDEV_LINK, &trigger_data->mode);
+		invert = test_bit(TRIGGER_NETDEV_LINK, &trigger_data->mode) ||
+			 test_bit(TRIGGER_NETDEV_LINK_10, &trigger_data->mode) ||
+			 test_bit(TRIGGER_NETDEV_LINK_100, &trigger_data->mode) ||
+			 test_bit(TRIGGER_NETDEV_LINK_1000, &trigger_data->mode) ||
+			 test_bit(TRIGGER_NETDEV_HALF_DUPLEX, &trigger_data->mode) ||
+			 test_bit(TRIGGER_NETDEV_FULL_DUPLEX, &trigger_data->mode);
 		interval = jiffies_to_msecs(
 				atomic_read(&trigger_data->interval));
 		/* base state is ON (link present) */
@@ -358,6 +538,8 @@ static void netdev_trig_work(struct work_struct *work)
 static int netdev_trig_activate(struct led_classdev *led_cdev)
 {
 	struct led_netdev_data *trigger_data;
+	unsigned long mode = 0;
+	struct device *dev;
 	int rc;
 
 	trigger_data = kzalloc(sizeof(struct led_netdev_data), GFP_KERNEL);
@@ -376,9 +558,24 @@ static int netdev_trig_activate(struct led_classdev *led_cdev)
 	trigger_data->device_name[0] = 0;
 
 	trigger_data->mode = 0;
-	atomic_set(&trigger_data->interval, msecs_to_jiffies(50));
+	atomic_set(&trigger_data->interval, msecs_to_jiffies(NETDEV_LED_DEFAULT_INTERVAL));
 	trigger_data->last_activity = 0;
 
+	/* Check if hw control is active by default on the LED.
+	 * Init already enabled mode in hw control.
+	 */
+	if (supports_hw_control(led_cdev) &&
+	    !led_cdev->hw_control_get(led_cdev, &mode)) {
+		dev = led_cdev->hw_control_get_device(led_cdev);
+		if (dev) {
+			const char *name = dev_name(dev);
+
+			set_device_name(trigger_data, name, strlen(name));
+			trigger_data->hw_control = true;
+			trigger_data->mode = mode;
+		}
+	}
+
 	led_set_trigger_data(led_cdev, trigger_data);
 
 	rc = register_netdevice_notifier(&trigger_data->notifier);