netdev - Re: [PATCH v2 net-next 1/2] net: dsa: Add support for devlink device parameters

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Message-ID: <20191004202122.GD32368@t480s.localdomain>
Date:   Fri, 4 Oct 2019 20:21:22 -0400
From:   Vivien Didelot <vivien.didelot@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH v2 net-next 1/2] net: dsa: Add support for devlink device
 parameters

On Fri,  4 Oct 2019 23:09:33 +0200, Andrew Lunn <andrew@...n.ch> wrote:
> Add plumbing to allow DSA drivers to register parameters with devlink.
> 
> To keep with the abstraction, the DSA drivers pass the ds structure to
> these helpers, and the DSA core then translates that to the devlink
> structure associated to the device.
> 
> Signed-off-by: Andrew Lunn <andrew@...n.ch>
> ---
>  include/net/dsa.h | 23 +++++++++++++++++++++++
>  net/dsa/dsa.c     | 48 +++++++++++++++++++++++++++++++++++++++++++++++
>  net/dsa/dsa2.c    |  7 ++++++-
>  3 files changed, 77 insertions(+), 1 deletion(-)
> 
> diff --git a/include/net/dsa.h b/include/net/dsa.h
> index 8c3ea0530f65..6623f4428930 100644
> --- a/include/net/dsa.h
> +++ b/include/net/dsa.h
> @@ -541,6 +541,29 @@ struct dsa_switch_ops {
>  	 */
>  	netdev_tx_t (*port_deferred_xmit)(struct dsa_switch *ds, int port,
>  					  struct sk_buff *skb);
> +	/* Devlink parameters */
> +	int	(*devlink_param_get)(struct dsa_switch *ds, u32 id,
> +				     struct devlink_param_gset_ctx *ctx);
> +	int	(*devlink_param_set)(struct dsa_switch *ds, u32 id,
> +				     struct devlink_param_gset_ctx *ctx);

Unless that is how devlink is designed, shouldn't ctx be const on _set?


Thanks,

	Vivien

> +};
> +
> +#define DSA_DEVLINK_PARAM_DRIVER(_id, _name, _type, _cmodes)		\
> +	DEVLINK_PARAM_DRIVER(_id, _name, _type, _cmodes,		\
> +			     dsa_dl_param_get,	dsa_dl_param_set, NULL)
> +
> +int dsa_dl_param_get(struct devlink *dl, u32 id,
> +		     struct devlink_param_gset_ctx *ctx);
> +int dsa_dl_param_set(struct devlink *dl, u32 id,
> +		     struct devlink_param_gset_ctx *ctx);
> +int dsa_devlink_params_register(struct dsa_switch *ds,
> +				const struct devlink_param *params,
> +				size_t params_count);
> +void dsa_devlink_params_unregister(struct dsa_switch *ds,
> +				   const struct devlink_param *params,
> +				   size_t params_count);
> +struct dsa_devlink_priv {
> +	struct dsa_switch *ds;
>  };
>  
>  struct dsa_switch_driver {
> diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
> index 43120a3fb06f..ea7678650d8c 100644
> --- a/net/dsa/dsa.c
> +++ b/net/dsa/dsa.c
> @@ -329,6 +329,54 @@ int call_dsa_notifiers(unsigned long val, struct net_device *dev,
>  }
>  EXPORT_SYMBOL_GPL(call_dsa_notifiers);
>  
> +int dsa_dl_param_get(struct devlink *dl, u32 id,
> +		     struct devlink_param_gset_ctx *ctx)
> +{
> +	struct dsa_devlink_priv *dl_priv;
> +	struct dsa_switch *ds;
> +
> +	dl_priv = devlink_priv(dl);
> +	ds = dl_priv->ds;
> +
> +	if (!ds->ops->devlink_param_get)
> +		return -EOPNOTSUPP;
> +
> +	return ds->ops->devlink_param_get(ds, id, ctx);
> +}
> +EXPORT_SYMBOL_GPL(dsa_dl_param_get);
> +
> +int dsa_dl_param_set(struct devlink *dl, u32 id,
> +		     struct devlink_param_gset_ctx *ctx)
> +{
> +	struct dsa_devlink_priv *dl_priv;
> +	struct dsa_switch *ds;
> +
> +	dl_priv = devlink_priv(dl);
> +	ds = dl_priv->ds;
> +
> +	if (!ds->ops->devlink_param_set)
> +		return -EOPNOTSUPP;
> +
> +	return ds->ops->devlink_param_set(ds, id, ctx);
> +}
> +EXPORT_SYMBOL_GPL(dsa_dl_param_set);
> +
> +int dsa_devlink_params_register(struct dsa_switch *ds,
> +				const struct devlink_param *params,
> +				size_t params_count)
> +{
> +	return devlink_params_register(ds->devlink, params, params_count);
> +}
> +EXPORT_SYMBOL_GPL(dsa_devlink_params_register);
> +
> +void dsa_devlink_params_unregister(struct dsa_switch *ds,
> +				   const struct devlink_param *params,
> +				   size_t params_count)
> +{
> +	devlink_params_unregister(ds->devlink, params, params_count);
> +}
> +EXPORT_SYMBOL_GPL(dsa_devlink_params_unregister);
> +
>  static int __init dsa_init_module(void)
>  {
>  	int rc;
> diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
> index 73002022c9d8..d74cc82fb44a 100644
> --- a/net/dsa/dsa2.c
> +++ b/net/dsa/dsa2.c
> @@ -367,6 +367,7 @@ static void dsa_port_teardown(struct dsa_port *dp)
>  
>  static int dsa_switch_setup(struct dsa_switch *ds)
>  {
> +	struct dsa_devlink_priv *dl_priv;
>  	int err = 0;
>  
>  	/* Initialize ds->phys_mii_mask before registering the slave MDIO bus
> @@ -379,9 +380,11 @@ static int dsa_switch_setup(struct dsa_switch *ds)
>  	/* Add the switch to devlink before calling setup, so that setup can
>  	 * add dpipe tables
>  	 */
> -	ds->devlink = devlink_alloc(&dsa_devlink_ops, 0);
> +	ds->devlink = devlink_alloc(&dsa_devlink_ops, sizeof(*devlink_priv));
>  	if (!ds->devlink)
>  		return -ENOMEM;
> +	dl_priv = devlink_priv(ds->devlink);
> +	dl_priv->ds = ds;
>  
>  	err = devlink_register(ds->devlink, ds->dev);
>  	if (err)
> @@ -395,6 +398,8 @@ static int dsa_switch_setup(struct dsa_switch *ds)
>  	if (err < 0)
>  		goto unregister_notifier;
>  
> +	devlink_params_publish(ds->devlink);
> +
>  	if (!ds->slave_mii_bus && ds->ops->phy_read) {
>  		ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
>  		if (!ds->slave_mii_bus) {
> -- 
> 2.23.0
>