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authorChristian Marangi <ansuelsmth@gmail.com>2024-01-11 17:04:54 +0100
committerLee Jones <lee@kernel.org>2024-03-07 08:47:57 +0000
commit06cdca014eca3449d8c34bf7c2fcb796a114a0b8 (patch)
treebdcb6663f120256d4bd7dca803c174591fe56fff /drivers/leds
parent66601a29bb23b61f9676f51c0b4b78b38c601536 (diff)
leds: trigger: netdev: Display only supported link speed attribute
With the addition of more link speed mode to the netdev trigger, it was pointed out that there may be a problem with bloating the attribute list with modes that won't ever be supported by the trigger as the attached device name doesn't support them. To clear and address this problem, change the logic where these additional trigger modes are listed. Since the netdev trigger REQUIRE a device name to be set, attach to the device name change function additional logic to parse the supported link speed modes using ethtool APIs and show only the supported link speed modes attribute. Link speed attribute are refreshed on device_name set and on NETDEV_CHANGE events. This only apply to the link speed modes and every other mode is still provided by default. Signed-off-by: Christian Marangi <ansuelsmth@gmail.com> Reviewed-by: Marek BehĂșn <kabel@kernel.org> Link: https://lore.kernel.org/r/20240111160501.1774-1-ansuelsmth@gmail.com Signed-off-by: Lee Jones <lee@kernel.org>
Diffstat (limited to 'drivers/leds')
-rw-r--r--drivers/leds/trigger/ledtrig-netdev.c90
1 files changed, 84 insertions, 6 deletions
diff --git a/drivers/leds/trigger/ledtrig-netdev.c b/drivers/leds/trigger/ledtrig-netdev.c
index e22a7b08279b..f0eb5820c48c 100644
--- a/drivers/leds/trigger/ledtrig-netdev.c
+++ b/drivers/leds/trigger/ledtrig-netdev.c
@@ -18,10 +18,12 @@
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/leds.h>
+#include <linux/linkmode.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/mutex.h>
+#include <linux/phy.h>
#include <linux/rtnetlink.h>
#include <linux/timer.h>
#include "../leds.h"
@@ -65,12 +67,15 @@ struct led_netdev_data {
unsigned long mode;
int link_speed;
+ __ETHTOOL_DECLARE_LINK_MODE_MASK(supported_link_modes);
u8 duplex;
bool carrier_link_up;
bool hw_control;
};
+static const struct attribute_group netdev_trig_link_speed_attrs_group;
+
static void set_baseline_state(struct led_netdev_data *trigger_data)
{
int current_brightness;
@@ -218,13 +223,20 @@ 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)
+
+ if (__ethtool_get_link_ksettings(trigger_data->net_dev, &cmd))
return;
- if (!__ethtool_get_link_ksettings(trigger_data->net_dev, &cmd)) {
+ if (trigger_data->carrier_link_up) {
trigger_data->link_speed = cmd.base.speed;
trigger_data->duplex = cmd.base.duplex;
}
+
+ /*
+ * Have a local copy of the link speed supported to avoid rtnl lock every time
+ * modes are refreshed on any change event
+ */
+ linkmode_copy(trigger_data->supported_link_modes, cmd.link_modes.supported);
}
static ssize_t device_name_show(struct device *dev,
@@ -298,6 +310,10 @@ static ssize_t device_name_store(struct device *dev,
if (ret < 0)
return ret;
+
+ /* Refresh link_speed visibility */
+ sysfs_update_group(&dev->kobj, &netdev_trig_link_speed_attrs_group);
+
return size;
}
@@ -461,15 +477,63 @@ static ssize_t offloaded_show(struct device *dev,
static DEVICE_ATTR_RO(offloaded);
-static struct attribute *netdev_trig_attrs[] = {
- &dev_attr_device_name.attr,
- &dev_attr_link.attr,
+#define CHECK_LINK_MODE_ATTR(link_speed) \
+ do { \
+ if (attr == &dev_attr_link_##link_speed.attr && \
+ link_ksettings.base.speed == SPEED_##link_speed) \
+ return attr->mode; \
+ } while (0)
+
+static umode_t netdev_trig_link_speed_visible(struct kobject *kobj,
+ struct attribute *attr, int n)
+{
+ struct device *dev = kobj_to_dev(kobj);
+ struct led_netdev_data *trigger_data;
+ unsigned long *supported_link_modes;
+ u32 mode;
+
+ trigger_data = led_trigger_get_drvdata(dev);
+ supported_link_modes = trigger_data->supported_link_modes;
+
+ /*
+ * Search in the supported link mode mask a matching supported mode.
+ * Stop at the first matching entry as we care only to check if a particular
+ * speed is supported and not the kind.
+ */
+ for_each_set_bit(mode, supported_link_modes, __ETHTOOL_LINK_MODE_MASK_NBITS) {
+ struct ethtool_link_ksettings link_ksettings;
+
+ ethtool_params_from_link_mode(&link_ksettings, mode);
+
+ CHECK_LINK_MODE_ATTR(10);
+ CHECK_LINK_MODE_ATTR(100);
+ CHECK_LINK_MODE_ATTR(1000);
+ CHECK_LINK_MODE_ATTR(2500);
+ CHECK_LINK_MODE_ATTR(5000);
+ CHECK_LINK_MODE_ATTR(10000);
+ }
+
+ return 0;
+}
+
+static struct attribute *netdev_trig_link_speed_attrs[] = {
&dev_attr_link_10.attr,
&dev_attr_link_100.attr,
&dev_attr_link_1000.attr,
&dev_attr_link_2500.attr,
&dev_attr_link_5000.attr,
&dev_attr_link_10000.attr,
+ NULL
+};
+
+static const struct attribute_group netdev_trig_link_speed_attrs_group = {
+ .attrs = netdev_trig_link_speed_attrs,
+ .is_visible = netdev_trig_link_speed_visible,
+};
+
+static struct attribute *netdev_trig_attrs[] = {
+ &dev_attr_device_name.attr,
+ &dev_attr_link.attr,
&dev_attr_full_duplex.attr,
&dev_attr_half_duplex.attr,
&dev_attr_rx.attr,
@@ -478,7 +542,16 @@ static struct attribute *netdev_trig_attrs[] = {
&dev_attr_offloaded.attr,
NULL
};
-ATTRIBUTE_GROUPS(netdev_trig);
+
+static const struct attribute_group netdev_trig_attrs_group = {
+ .attrs = netdev_trig_attrs,
+};
+
+static const struct attribute_group *netdev_trig_groups[] = {
+ &netdev_trig_attrs_group,
+ &netdev_trig_link_speed_attrs_group,
+ NULL,
+};
static int netdev_trig_notify(struct notifier_block *nb,
unsigned long evt, void *dv)
@@ -487,6 +560,7 @@ static int netdev_trig_notify(struct notifier_block *nb,
netdev_notifier_info_to_dev((struct netdev_notifier_info *)dv);
struct led_netdev_data *trigger_data =
container_of(nb, struct led_netdev_data, notifier);
+ struct led_classdev *led_cdev = trigger_data->led_cdev;
if (evt != NETDEV_UP && evt != NETDEV_DOWN && evt != NETDEV_CHANGE
&& evt != NETDEV_REGISTER && evt != NETDEV_UNREGISTER
@@ -521,6 +595,10 @@ static int netdev_trig_notify(struct notifier_block *nb,
case NETDEV_UP:
case NETDEV_CHANGE:
get_device_state(trigger_data);
+ /* Refresh link_speed visibility */
+ if (evt == NETDEV_CHANGE)
+ sysfs_update_group(&led_cdev->dev->kobj,
+ &netdev_trig_link_speed_attrs_group);
break;
}