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Message-ID: <20240410234539.gzqt223s4kgpjwko@skbuf>
Date: Thu, 11 Apr 2024 02:45:39 +0300
From: Vladimir Oltean <olteanv@...il.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: Florian Fainelli <f.fainelli@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Russell King <linux@...linux.org.uk>,
	Gregory Clement <gregory.clement@...tlin.com>,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next v4 7/8] dsa: mv88e6xxx: Create port/netdev LEDs

Nitpick: title: net: dsa: mv88e6xxx

On Sat, Apr 06, 2024 at 03:13:34PM -0500, Andrew Lunn wrote:
> Make use of the helpers to add LEDs to the user ports when the port is
> setup. Also remove the LEDs when the port is destroyed to avoid any
> race conditions with users of /sys/class/leds and LED triggers after
> the driver has been removed.
> 
> Signed-off-by: Andrew Lunn <andrew@...n.ch>
> ---
>  drivers/net/dsa/mv88e6xxx/Kconfig |   1 +
>  drivers/net/dsa/mv88e6xxx/chip.c  | 119 +++++++++++++++++++++++++++++++++++++-
>  drivers/net/dsa/mv88e6xxx/chip.h  |  13 +++++
>  3 files changed, 132 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/dsa/mv88e6xxx/Kconfig b/drivers/net/dsa/mv88e6xxx/Kconfig
> index e3181d5471df..ded5c6b9132b 100644
> --- a/drivers/net/dsa/mv88e6xxx/Kconfig
> +++ b/drivers/net/dsa/mv88e6xxx/Kconfig
> @@ -5,6 +5,7 @@ config NET_DSA_MV88E6XXX
>  	select IRQ_DOMAIN
>  	select NET_DSA_TAG_EDSA
>  	select NET_DSA_TAG_DSA
> +	select NETDEV_LEDS

Do we want mv88e6xxx to select NETDEV_LEDS, or also to be able to build
it without LED control?

If we want to select, do we always want drivers to select NETDEV_LEDS?
Maybe hide the help text from the NETDEV_LEDS option, make it invisible
to the user?

>  	help
>  	  This driver adds support for most of the Marvell 88E6xxx models of
>  	  Ethernet switch chips, except 88E6060.
> diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
> index 3d7e4aa9293a..4e4031f11088 100644
> --- a/drivers/net/dsa/mv88e6xxx/chip.c
> +++ b/drivers/net/dsa/mv88e6xxx/chip.c
> @@ -31,6 +31,7 @@
>  #include <linux/gpio/consumer.h>
>  #include <linux/phylink.h>
>  #include <net/dsa.h>
> +#include <net/netdev_leds.h>
>  
>  #include "chip.h"
>  #include "devlink.h"
> @@ -3129,6 +3130,105 @@ static int mv88e6xxx_switch_reset(struct mv88e6xxx_chip *chip)
>  	return mv88e6xxx_software_reset(chip);
>  }
>  
> +static int mv88e6xxx_led_brightness_set(struct net_device *ndev,
> +					u8 led, enum led_brightness value)
> +{
> +	struct dsa_port *dp = dsa_port_from_netdev(ndev);
> +	struct mv88e6xxx_chip *chip = dp->ds->priv;
> +	int port = dp->index;
> +	int err;
> +
> +	if (chip->info->ops->led_brightness_set) {
> +		mv88e6xxx_reg_lock(chip);
> +		err = chip->info->ops->led_brightness_set(chip, port, led,
> +							  value);
> +		mv88e6xxx_reg_unlock(chip);
> +		return err;
> +	}
> +	return -EOPNOTSUPP;

The opposite looks more natural, if (!ops) return -EOPNOTSUPP, followed
by the normal code with 1 level of indentation less.

Comment applicable to all netdev_leds_ops below.

> +}
> +
>  static int mv88e6xxx_set_port_mode(struct mv88e6xxx_chip *chip, int port,
>  				   enum mv88e6xxx_frame_mode frame,
>  				   enum mv88e6xxx_egress_mode egress, u16 etype)
> @@ -4006,7 +4106,9 @@ static int mv88e6xxx_setup(struct dsa_switch *ds)
>  
>  static int mv88e6xxx_port_setup(struct dsa_switch *ds, int port)
>  {
> +	struct dsa_port *dp = dsa_to_port(ds, port);
>  	struct mv88e6xxx_chip *chip = ds->priv;
> +	struct mv88e6xxx_port *p;
>  	int err;
>  
>  	if (chip->info->ops->pcs_ops &&
> @@ -4016,13 +4118,28 @@ static int mv88e6xxx_port_setup(struct dsa_switch *ds, int port)
>  			return err;
>  	}
>  
> -	return mv88e6xxx_setup_devlink_regions_port(ds, port);

Unfortunate, but there is an existing bug here. chip->info->ops->pcs_ops->pcs_init()
allocates memory. If mv88e6xxx_setup_devlink_regions_port() fails here,
that's memory we're not freeing, by not calling chip->info->ops->pcs_ops->pcs_teardown().

> +	err  = mv88e6xxx_setup_devlink_regions_port(ds, port);
> +	if (err)
> +		return err;
> +
> +	if (dp->dn && dsa_is_user_port(ds, port)) {
> +		p = &chip->ports[port];
> +		INIT_LIST_HEAD(&p->leds);
> +		err = netdev_leds_setup(dp->user, dp->dn, &p->leds,
> +					&mv88e6xxx_netdev_leds_ops, 2);

Does anything bad happen with netdev_leds_setup() on platform_data?
OF APIs are pretty NULL-tolerant.

> +		if (err)
> +			mv88e6xxx_teardown_devlink_regions_port(ds, port);
> +	}
> +	return err;
>  }
>  
>  static void mv88e6xxx_port_teardown(struct dsa_switch *ds, int port)
>  {
>  	struct mv88e6xxx_chip *chip = ds->priv;
>  
> +	if (dsa_is_user_port(ds, port))
> +		netdev_leds_teardown(&chip->ports[port].leds);

On platform_data, we are calling netdev_leds_teardown() when we never
called netdev_leds_setup() and never initialized the port leds list.

> +
>  	mv88e6xxx_teardown_devlink_regions_port(ds, port);
>  
>  	if (chip->info->ops->pcs_ops &&
> diff --git a/drivers/net/dsa/mv88e6xxx/chip.h b/drivers/net/dsa/mv88e6xxx/chip.h
> index 64f8bde68ccf..d15bb5810831 100644
> --- a/drivers/net/dsa/mv88e6xxx/chip.h
> +++ b/drivers/net/dsa/mv88e6xxx/chip.h
> @@ -291,6 +291,9 @@ struct mv88e6xxx_port {
>  
>  	/* MacAuth Bypass control flag */
>  	bool mab;
> +
> +	/* LEDs associated to the port */
> +	struct list_head leds;
>  };
>  
>  enum mv88e6xxx_region_id {
> @@ -432,6 +435,7 @@ struct mv88e6xxx_chip {
>  
>  	/* Bridge MST to SID mappings */
>  	struct list_head msts;
> +

Stray change.

>  };
>  
>  struct mv88e6xxx_bus_ops {
> @@ -668,6 +672,15 @@ struct mv88e6xxx_ops {
>  	int (*led_blink_set)(struct mv88e6xxx_chip *chip, int port, u8 led,
>  			     unsigned long *delay_on,
>  			     unsigned long *delay_off);
> +	int (*led_hw_control_is_supported)(struct mv88e6xxx_chip *chip,
> +					   int port, u8 led,
> +					   unsigned long flags);
> +	int (*led_hw_control_set)(struct mv88e6xxx_chip *chip,
> +				  int port, u8 led,
> +				  unsigned long flags);
> +	int (*led_hw_control_get)(struct mv88e6xxx_chip *chip,
> +				  int port, u8 led,
> +				  unsigned long *flags);
>  };
>  
>  struct mv88e6xxx_irq_ops {
> 
> -- 
> 2.43.0
> 

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