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Date:   Wed, 9 Sep 2020 19:03:37 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] net: dsa: b53: Report VLAN table occupancy via
 devlink

On Tue, Sep 08, 2020 at 09:32:34PM -0700, Florian Fainelli wrote:
> We already maintain an array of VLANs used by the switch so we can
> simply iterate over it to report the occupancy via devlink.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  drivers/net/dsa/b53/b53_common.c | 59 ++++++++++++++++++++++++++++++--
>  drivers/net/dsa/b53/b53_priv.h   |  1 +
>  drivers/net/dsa/bcm_sf2.c        |  8 ++++-
>  3 files changed, 65 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
> index 26fcff85d881..a1527665e817 100644
> --- a/drivers/net/dsa/b53/b53_common.c
> +++ b/drivers/net/dsa/b53/b53_common.c
> @@ -977,6 +977,53 @@ int b53_get_sset_count(struct dsa_switch *ds, int port, int sset)
>  }
>  EXPORT_SYMBOL(b53_get_sset_count);
>  
> +enum b53_devlink_resource_id {
> +	B53_DEVLINK_PARMA_ID_VLAN_TABLE,

Parma is a city in Italy, maybe PARAM?

> +};
> +
> +static u64 b53_devlink_vlan_table_get(void *priv)
> +{
> +	struct b53_device *dev = priv;
> +	unsigned int i, count = 0;

Could you make count an u64 as well, since you're returning it into an
u64?

> +	struct b53_vlan *vl;
> +
> +	for (i = 0; i < dev->num_vlans; i++) {
> +		vl = &dev->vlans[i];
> +		if (vl->members)
> +			count++;
> +	}
> +
> +	return count;
> +}
> +
> +int b53_setup_devlink_resources(struct dsa_switch *ds)
> +{
> +	struct devlink_resource_size_params size_params;
> +	struct b53_device *dev = ds->priv;
> +	int err;
> +
> +	devlink_resource_size_params_init(&size_params, dev->num_vlans,
> +					  dev->num_vlans,
> +					  1, DEVLINK_RESOURCE_UNIT_ENTRY);
> +
> +	err = dsa_devlink_resource_register(ds, "VLAN", dev->num_vlans,
> +					    B53_DEVLINK_PARMA_ID_VLAN_TABLE,
> +					    DEVLINK_RESOURCE_ID_PARENT_TOP,
> +					    &size_params);
> +	if (err)
> +		goto out;
> +
> +	dsa_devlink_resource_occ_get_register(ds,
> +					      B53_DEVLINK_PARMA_ID_VLAN_TABLE,
> +					      b53_devlink_vlan_table_get, dev);
> +
> +	return 0;
> +out:
> +	dsa_devlink_resources_unregister(ds);
> +	return err;
> +}
> +EXPORT_SYMBOL(b53_setup_devlink_resources);
> +
>  static int b53_setup(struct dsa_switch *ds)
>  {
>  	struct b53_device *dev = ds->priv;
> @@ -992,8 +1039,10 @@ static int b53_setup(struct dsa_switch *ds)
>  	b53_reset_mib(dev);
>  
>  	ret = b53_apply_config(dev);
> -	if (ret)
> +	if (ret) {
>  		dev_err(ds->dev, "failed to apply configuration\n");
> +		return ret;
> +	}
>  
>  	/* Configure IMP/CPU port, disable all other ports. Enabled
>  	 * ports will be configured with .port_enable
> @@ -1012,7 +1061,12 @@ static int b53_setup(struct dsa_switch *ds)
>  	 */
>  	ds->vlan_filtering_is_global = true;
>  
> -	return ret;
> +	return b53_setup_devlink_resources(ds);
> +}
> +
> +static void b53_teardown(struct dsa_switch *ds)
> +{
> +	dsa_devlink_resources_unregister(ds);
>  }
>  
>  static void b53_force_link(struct b53_device *dev, int port, int link)
> @@ -2141,6 +2195,7 @@ static int b53_get_max_mtu(struct dsa_switch *ds, int port)
>  static const struct dsa_switch_ops b53_switch_ops = {
>  	.get_tag_protocol	= b53_get_tag_protocol,
>  	.setup			= b53_setup,
> +	.teardown		= b53_teardown,
>  	.get_strings		= b53_get_strings,
>  	.get_ethtool_stats	= b53_get_ethtool_stats,
>  	.get_sset_count		= b53_get_sset_count,
> diff --git a/drivers/net/dsa/b53/b53_priv.h b/drivers/net/dsa/b53/b53_priv.h
> index e942c60e4365..c55c0a9f1b47 100644
> --- a/drivers/net/dsa/b53/b53_priv.h
> +++ b/drivers/net/dsa/b53/b53_priv.h
> @@ -328,6 +328,7 @@ void b53_br_set_stp_state(struct dsa_switch *ds, int port, u8 state);
>  void b53_br_fast_age(struct dsa_switch *ds, int port);
>  int b53_br_egress_floods(struct dsa_switch *ds, int port,
>  			 bool unicast, bool multicast);
> +int b53_setup_devlink_resources(struct dsa_switch *ds);
>  void b53_port_event(struct dsa_switch *ds, int port);
>  void b53_phylink_validate(struct dsa_switch *ds, int port,
>  			  unsigned long *supported,
> diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
> index 3263e8a0ae67..723820603107 100644
> --- a/drivers/net/dsa/bcm_sf2.c
> +++ b/drivers/net/dsa/bcm_sf2.c
> @@ -936,7 +936,12 @@ static int bcm_sf2_sw_setup(struct dsa_switch *ds)
>  	b53_configure_vlan(ds);
>  	bcm_sf2_enable_acb(ds);
>  
> -	return 0;
> +	return b53_setup_devlink_resources(ds);
> +}
> +
> +static void bcm_sf2_sw_teardown(struct dsa_switch *ds)
> +{
> +	dsa_devlink_resources_unregister(ds);
>  }
>  
>  /* The SWITCH_CORE register space is managed by b53 but operates on a page +
> @@ -1073,6 +1078,7 @@ static int bcm_sf2_sw_get_sset_count(struct dsa_switch *ds, int port,
>  static const struct dsa_switch_ops bcm_sf2_ops = {
>  	.get_tag_protocol	= b53_get_tag_protocol,
>  	.setup			= bcm_sf2_sw_setup,
> +	.teardown		= bcm_sf2_sw_teardown,
>  	.get_strings		= bcm_sf2_sw_get_strings,
>  	.get_ethtool_stats	= bcm_sf2_sw_get_ethtool_stats,
>  	.get_sset_count		= bcm_sf2_sw_get_sset_count,
> -- 
> 2.25.1
> 

Thanks,
-Vladimir

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